126=7(3a-2)-7

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Solution for 126=7(3a-2)-7 equation:


Simplifying
126 = 7(3a + -2) + -7

Reorder the terms:
126 = 7(-2 + 3a) + -7
126 = (-2 * 7 + 3a * 7) + -7
126 = (-14 + 21a) + -7

Reorder the terms:
126 = -14 + -7 + 21a

Combine like terms: -14 + -7 = -21
126 = -21 + 21a

Solving
126 = -21 + 21a

Solving for variable 'a'.

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

Add '-21a' to each side of the equation.
126 + -21a = -21 + 21a + -21a

Combine like terms: 21a + -21a = 0
126 + -21a = -21 + 0
126 + -21a = -21

Add '-126' to each side of the equation.
126 + -126 + -21a = -21 + -126

Combine like terms: 126 + -126 = 0
0 + -21a = -21 + -126
-21a = -21 + -126

Combine like terms: -21 + -126 = -147
-21a = -147

Divide each side by '-21'.
a = 7

Simplifying
a = 7

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