x2+15=720+x4

Subtract x4 from both sides of the equation.

x2+15-x4=720

To write x2 as a fraction with a common denominator, multiply by 22.

x2⋅22-x4+15=720

Write each expression with a common denominator of 4, by multiplying each by an appropriate factor of 1.

Multiply x2 and 22.

x⋅22⋅2-x4+15=720

Multiply 2 by 2.

x⋅24-x4+15=720

x⋅24-x4+15=720

Combine the numerators over the common denominator.

x⋅2-x4+15=720

Subtract x from x⋅2.

Reorder x and 2.

2⋅x-x4+15=720

Subtract x from 2⋅x.

x4+15=720

x4+15=720

x4+15=720

Subtract 15 from both sides of the equation.

x4=720-15

To write -15 as a fraction with a common denominator, multiply by 44.

x4=720-15⋅44

Write each expression with a common denominator of 20, by multiplying each by an appropriate factor of 1.

Multiply 15 and 44.

x4=720-45⋅4

Multiply 5 by 4.

x4=720-420

x4=720-420

Combine the numerators over the common denominator.

x4=7-420

Subtract 4 from 7.

x4=320

x4=320

Multiply both sides of the equation by 4.

4⋅x4=4⋅320

Cancel the common factor of 4.

Cancel the common factor.

4⋅x4=4⋅320

Rewrite the expression.

x=4⋅320

x=4⋅320

Cancel the common factor of 4.

Factor 4 out of 20.

x=4⋅34(5)

Cancel the common factor.

x=4⋅34⋅5

Rewrite the expression.

x=35

x=35

x=35

The result can be shown in multiple forms.

Exact Form:

x=35

Decimal Form:

x=0.6

Solve for x x/2+1/5=7/20+x/4