66=-4(7a-1)-3a

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Solution for 66=-4(7a-1)-3a equation: 


Simplifying
66 = -4(7a + -1) + -3a

Reorder the terms:
66 = -4(-1 + 7a) + -3a
66 = (-1 * -4 + 7a * -4) + -3a
66 = (4 + -28a) + -3a

Combine like terms: -28a + -3a = -31a
66 = 4 + -31a

Solving
66 = 4 + -31a

Solving for variable 'a'.

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

Add '31a' to each side of the equation.
66 + 31a = 4 + -31a + 31a

Combine like terms: -31a + 31a = 0
66 + 31a = 4 + 0
66 + 31a = 4

Add '-66' to each side of the equation.
66 + -66 + 31a = 4 + -66

Combine like terms: 66 + -66 = 0
0 + 31a = 4 + -66
31a = 4 + -66

Combine like terms: 4 + -66 = -62
31a = -62

Divide each side by '31'.
a = -2

Simplifying
a = -2

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