(126-5a)+3(7-2a)=180

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Solution for (126-5a)+3(7-2a)=180 equation:


Simplifying
(126 + -5a) + 3(7 + -2a) = 180

Remove parenthesis around (126 + -5a)
126 + -5a + 3(7 + -2a) = 180
126 + -5a + (7 * 3 + -2a * 3) = 180
126 + -5a + (21 + -6a) = 180

Reorder the terms:
126 + 21 + -5a + -6a = 180

Combine like terms: 126 + 21 = 147
147 + -5a + -6a = 180

Combine like terms: -5a + -6a = -11a
147 + -11a = 180

Solving
147 + -11a = 180

Solving for variable 'a'.

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

Add '-147' to each side of the equation.
147 + -147 + -11a = 180 + -147

Combine like terms: 147 + -147 = 0
0 + -11a = 180 + -147
-11a = 180 + -147

Combine like terms: 180 + -147 = 33
-11a = 33

Divide each side by '-11'.
a = -3

Simplifying
a = -3

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