138-(7x+15)=7(x+9)+x

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Solution for 138-(7x+15)=7(x+9)+x equation:


Simplifying
138 + -1(7x + 15) = 7(x + 9) + x

Reorder the terms:
138 + -1(15 + 7x) = 7(x + 9) + x
138 + (15 * -1 + 7x * -1) = 7(x + 9) + x
138 + (-15 + -7x) = 7(x + 9) + x

Combine like terms: 138 + -15 = 123
123 + -7x = 7(x + 9) + x

Reorder the terms:
123 + -7x = 7(9 + x) + x
123 + -7x = (9 * 7 + x * 7) + x
123 + -7x = (63 + 7x) + x

Combine like terms: 7x + x = 8x
123 + -7x = 63 + 8x

Solving
123 + -7x = 63 + 8x

Solving for variable 'x'.

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

Add '-8x' to each side of the equation.
123 + -7x + -8x = 63 + 8x + -8x

Combine like terms: -7x + -8x = -15x
123 + -15x = 63 + 8x + -8x

Combine like terms: 8x + -8x = 0
123 + -15x = 63 + 0
123 + -15x = 63

Add '-123' to each side of the equation.
123 + -123 + -15x = 63 + -123

Combine like terms: 123 + -123 = 0
0 + -15x = 63 + -123
-15x = 63 + -123

Combine like terms: 63 + -123 = -60
-15x = -60

Divide each side by '-15'.
x = 4

Simplifying
x = 4

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