20=-4(3a)

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Solution for 20=-4(3a) equation:


Simplifying
20 = -4(3a)

Remove parenthesis around (3a)
20 = -4 * 3a

Multiply -4 * 3
20 = -12a

Solving
20 = -12a

Solving for variable 'a'.

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

Add '12a' to each side of the equation.
20 + 12a = -12a + 12a

Combine like terms: -12a + 12a = 0
20 + 12a = 0

Add '-20' to each side of the equation.
20 + -20 + 12a = 0 + -20

Combine like terms: 20 + -20 = 0
0 + 12a = 0 + -20
12a = 0 + -20

Combine like terms: 0 + -20 = -20
12a = -20

Divide each side by '12'.
a = -1.666666667

Simplifying
a = -1.666666667

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