21x-42-7x=2x-18-9

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Solution for 21x-42-7x=2x-18-9 equation:


Simplifying
21x + -42 + -7x = 2x + -18 + -9

Reorder the terms:
-42 + 21x + -7x = 2x + -18 + -9

Combine like terms: 21x + -7x = 14x
-42 + 14x = 2x + -18 + -9

Reorder the terms:
-42 + 14x = -18 + -9 + 2x

Combine like terms: -18 + -9 = -27
-42 + 14x = -27 + 2x

Solving
-42 + 14x = -27 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
-42 + 14x + -2x = -27 + 2x + -2x

Combine like terms: 14x + -2x = 12x
-42 + 12x = -27 + 2x + -2x

Combine like terms: 2x + -2x = 0
-42 + 12x = -27 + 0
-42 + 12x = -27

Add '42' to each side of the equation.
-42 + 42 + 12x = -27 + 42

Combine like terms: -42 + 42 = 0
0 + 12x = -27 + 42
12x = -27 + 42

Combine like terms: -27 + 42 = 15
12x = 15

Divide each side by '12'.
x = 1.25

Simplifying
x = 1.25

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