(21-2a)+(126-5a)=180

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Solution for (21-2a)+(126-5a)=180 equation:


Simplifying
(21 + -2a) + (126 + -5a) = 180

Remove parenthesis around (21 + -2a)
21 + -2a + (126 + -5a) = 180

Remove parenthesis around (126 + -5a)
21 + -2a + 126 + -5a = 180

Reorder the terms:
21 + 126 + -2a + -5a = 180

Combine like terms: 21 + 126 = 147
147 + -2a + -5a = 180

Combine like terms: -2a + -5a = -7a
147 + -7a = 180

Solving
147 + -7a = 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 + -7a = 180 + -147

Combine like terms: 147 + -147 = 0
0 + -7a = 180 + -147
-7a = 180 + -147

Combine like terms: 180 + -147 = 33
-7a = 33

Divide each side by '-7'.
a = -4.714285714

Simplifying
a = -4.714285714

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