21x+12=7x-18

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Solution for 21x+12=7x-18 equation:


Simplifying
21x + 12 = 7x + -18

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

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

Solving
12 + 21x = -18 + 7x

Solving for variable 'x'.

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

Add '-7x' to each side of the equation.
12 + 21x + -7x = -18 + 7x + -7x

Combine like terms: 21x + -7x = 14x
12 + 14x = -18 + 7x + -7x

Combine like terms: 7x + -7x = 0
12 + 14x = -18 + 0
12 + 14x = -18

Add '-12' to each side of the equation.
12 + -12 + 14x = -18 + -12

Combine like terms: 12 + -12 = 0
0 + 14x = -18 + -12
14x = -18 + -12

Combine like terms: -18 + -12 = -30
14x = -30

Divide each side by '14'.
x = -2.142857143

Simplifying
x = -2.142857143

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