3(2a+7)-3a=18

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


Simplifying
3(2a + 7) + -3a = 18

Reorder the terms:
3(7 + 2a) + -3a = 18
(7 * 3 + 2a * 3) + -3a = 18
(21 + 6a) + -3a = 18

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

Solving
21 + 3a = 18

Solving for variable 'a'.

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

Add '-21' to each side of the equation.
21 + -21 + 3a = 18 + -21

Combine like terms: 21 + -21 = 0
0 + 3a = 18 + -21
3a = 18 + -21

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

Divide each side by '3'.
a = -1

Simplifying
a = -1

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