-42=-2a-3(-4a+4)

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Solution for -42=-2a-3(-4a+4) equation:


Simplifying
-42 = -2a + -3(-4a + 4)

Reorder the terms:
-42 = -2a + -3(4 + -4a)
-42 = -2a + (4 * -3 + -4a * -3)
-42 = -2a + (-12 + 12a)

Reorder the terms:
-42 = -12 + -2a + 12a

Combine like terms: -2a + 12a = 10a
-42 = -12 + 10a

Solving
-42 = -12 + 10a

Solving for variable 'a'.

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

Add '-10a' to each side of the equation.
-42 + -10a = -12 + 10a + -10a

Combine like terms: 10a + -10a = 0
-42 + -10a = -12 + 0
-42 + -10a = -12

Add '42' to each side of the equation.
-42 + 42 + -10a = -12 + 42

Combine like terms: -42 + 42 = 0
0 + -10a = -12 + 42
-10a = -12 + 42

Combine like terms: -12 + 42 = 30
-10a = 30

Divide each side by '-10'.
a = -3

Simplifying
a = -3

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