-2-7(1-3a)=-20

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Solution for -2-7(1-3a)=-20 equation: 


Simplifying
-2 + -7(1 + -3a) = -20
-2 + (1 * -7 + -3a * -7) = -20
-2 + (-7 + 21a) = -20

Combine like terms: -2 + -7 = -9
-9 + 21a = -20

Solving
-9 + 21a = -20

Solving for variable 'a'.

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

Add '9' to each side of the equation.
-9 + 9 + 21a = -20 + 9

Combine like terms: -9 + 9 = 0
0 + 21a = -20 + 9
21a = -20 + 9

Combine like terms: -20 + 9 = -11
21a = -11

Divide each side by '21'.
a = -0.5238095238

Simplifying
a = -0.5238095238

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