7X-12-18X=21

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Solution for 7X-12-18X=21 equation:


Simplifying
7X + -12 + -18X = 21

Reorder the terms:
-12 + 7X + -18X = 21

Combine like terms: 7X + -18X = -11X
-12 + -11X = 21

Solving
-12 + -11X = 21

Solving for variable 'X'.

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

Add '12' to each side of the equation.
-12 + 12 + -11X = 21 + 12

Combine like terms: -12 + 12 = 0
0 + -11X = 21 + 12
-11X = 21 + 12

Combine like terms: 21 + 12 = 33
-11X = 33

Divide each side by '-11'.
X = -3

Simplifying
X = -3

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