30-15=3(x-7)

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Solution for 30-15=3(x-7) equation: 


Simplifying
30 + -15 = 3(x + -7)

Combine like terms: 30 + -15 = 15
15 = 3(x + -7)

Reorder the terms:
15 = 3(-7 + x)
15 = (-7 * 3 + x * 3)
15 = (-21 + 3x)

Solving
15 = -21 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
15 + -3x = -21 + 3x + -3x

Combine like terms: 3x + -3x = 0
15 + -3x = -21 + 0
15 + -3x = -21

Add '-15' to each side of the equation.
15 + -15 + -3x = -21 + -15

Combine like terms: 15 + -15 = 0
0 + -3x = -21 + -15
-3x = -21 + -15

Combine like terms: -21 + -15 = -36
-3x = -36

Divide each side by '-3'.
x = 12

Simplifying
x = 12

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