20-5a=-3+7(-7-2a)

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Solution for 20-5a=-3+7(-7-2a) equation:


Simplifying
20 + -5a = -3 + 7(-7 + -2a)
20 + -5a = -3 + (-7 * 7 + -2a * 7)
20 + -5a = -3 + (-49 + -14a)

Combine like terms: -3 + -49 = -52
20 + -5a = -52 + -14a

Solving
20 + -5a = -52 + -14a

Solving for variable 'a'.

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

Add '14a' to each side of the equation.
20 + -5a + 14a = -52 + -14a + 14a

Combine like terms: -5a + 14a = 9a
20 + 9a = -52 + -14a + 14a

Combine like terms: -14a + 14a = 0
20 + 9a = -52 + 0
20 + 9a = -52

Add '-20' to each side of the equation.
20 + -20 + 9a = -52 + -20

Combine like terms: 20 + -20 = 0
0 + 9a = -52 + -20
9a = -52 + -20

Combine like terms: -52 + -20 = -72
9a = -72

Divide each side by '9'.
a = -8

Simplifying
a = -8

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