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Simplifying
5x + 9 + 5x = 30 + 7x + 15 + 15

Reorder the terms:
9 + 5x + 5x = 30 + 7x + 15 + 15

Combine like terms: 5x + 5x = 10x
9 + 10x = 30 + 7x + 15 + 15

Reorder the terms:
9 + 10x = 30 + 15 + 15 + 7x

Combine like terms: 30 + 15 = 45
9 + 10x = 45 + 15 + 7x

Combine like terms: 45 + 15 = 60
9 + 10x = 60 + 7x

Solving
9 + 10x = 60 + 7x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-7x' to each side of the equation.
9 + 10x + -7x = 60 + 7x + -7x

Combine like terms: 10x + -7x = 3x
9 + 3x = 60 + 7x + -7x

Combine like terms: 7x + -7x = 0
9 + 3x = 60 + 0
9 + 3x = 60

Add '-9' to each side of the equation.
9 + -9 + 3x = 60 + -9

Combine like terms: 9 + -9 = 0
0 + 3x = 60 + -9
3x = 60 + -9

Combine like terms: 60 + -9 = 51
3x = 51

Divide each side by '3'.
x = 17

Simplifying
x = 17
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