18=-3(-7-2a)

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Solution for 18=-3(-7-2a) equation:


Simplifying
18 = -3(-7 + -2a)
18 = (-7 * -3 + -2a * -3)
18 = (21 + 6a)

Solving
18 = 21 + 6a

Solving for variable 'a'.

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

Add '-6a' to each side of the equation.
18 + -6a = 21 + 6a + -6a

Combine like terms: 6a + -6a = 0
18 + -6a = 21 + 0
18 + -6a = 21

Add '-18' to each side of the equation.
18 + -18 + -6a = 21 + -18

Combine like terms: 18 + -18 = 0
0 + -6a = 21 + -18
-6a = 21 + -18

Combine like terms: 21 + -18 = 3
-6a = 3

Divide each side by '-6'.
a = -0.5

Simplifying
a = -0.5

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