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

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


Simplifying
-1a + 7(1 + 3a) + -20 = 0
-1a + (1 * 7 + 3a * 7) + -20 = 0
-1a + (7 + 21a) + -20 = 0

Reorder the terms:
7 + -20 + -1a + 21a = 0

Combine like terms: 7 + -20 = -13
-13 + -1a + 21a = 0

Combine like terms: -1a + 21a = 20a
-13 + 20a = 0

Solving
-13 + 20a = 0

Solving for variable 'a'.

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

Add '13' to each side of the equation.
-13 + 13 + 20a = 0 + 13

Combine like terms: -13 + 13 = 0
0 + 20a = 0 + 13
20a = 0 + 13

Combine like terms: 0 + 13 = 13
20a = 13

Divide each side by '20'.
a = 0.65

Simplifying
a = 0.65

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