-(9+3)=-2(2a+1)-7

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Solution for -(9+3)=-2(2a+1)-7 equation:


Simplifying
-1(9 + 3) = -2(2a + 1) + -7

Combine like terms: 9 + 3 = 12
-1(12) = -2(2a + 1) + -7

Multiply -1 * 12
-12 = -2(2a + 1) + -7

Reorder the terms:
-12 = -2(1 + 2a) + -7
-12 = (1 * -2 + 2a * -2) + -7
-12 = (-2 + -4a) + -7

Reorder the terms:
-12 = -2 + -7 + -4a

Combine like terms: -2 + -7 = -9
-12 = -9 + -4a

Solving
-12 = -9 + -4a

Solving for variable 'a'.

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

Add '4a' to each side of the equation.
-12 + 4a = -9 + -4a + 4a

Combine like terms: -4a + 4a = 0
-12 + 4a = -9 + 0
-12 + 4a = -9

Add '12' to each side of the equation.
-12 + 12 + 4a = -9 + 12

Combine like terms: -12 + 12 = 0
0 + 4a = -9 + 12
4a = -9 + 12

Combine like terms: -9 + 12 = 3
4a = 3

Divide each side by '4'.
a = 0.75

Simplifying
a = 0.75

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