120=2a-(15-7a)

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Solution for 120=2a-(15-7a) equation:


Simplifying
120 = 2a + -1(15 + -7a)
120 = 2a + (15 * -1 + -7a * -1)
120 = 2a + (-15 + 7a)

Reorder the terms:
120 = -15 + 2a + 7a

Combine like terms: 2a + 7a = 9a
120 = -15 + 9a

Solving
120 = -15 + 9a

Solving for variable 'a'.

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

Add '-9a' to each side of the equation.
120 + -9a = -15 + 9a + -9a

Combine like terms: 9a + -9a = 0
120 + -9a = -15 + 0
120 + -9a = -15

Add '-120' to each side of the equation.
120 + -120 + -9a = -15 + -120

Combine like terms: 120 + -120 = 0
0 + -9a = -15 + -120
-9a = -15 + -120

Combine like terms: -15 + -120 = -135
-9a = -135

Divide each side by '-9'.
a = 15

Simplifying
a = 15

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