-18=15x+42-21x

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Solution for -18=15x+42-21x equation:


Simplifying
-18 = 15x + 42 + -21x

Reorder the terms:
-18 = 42 + 15x + -21x

Combine like terms: 15x + -21x = -6x
-18 = 42 + -6x

Solving
-18 = 42 + -6x

Solving for variable 'x'.

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

Add '6x' to each side of the equation.
-18 + 6x = 42 + -6x + 6x

Combine like terms: -6x + 6x = 0
-18 + 6x = 42 + 0
-18 + 6x = 42

Add '18' to each side of the equation.
-18 + 18 + 6x = 42 + 18

Combine like terms: -18 + 18 = 0
0 + 6x = 42 + 18
6x = 42 + 18

Combine like terms: 42 + 18 = 60
6x = 60

Divide each side by '6'.
x = 10

Simplifying
x = 10

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