18x+8=21x-7

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Solution for 18x+8=21x-7 equation:


Simplifying
18x + 8 = 21x + -7

Reorder the terms:
8 + 18x = 21x + -7

Reorder the terms:
8 + 18x = -7 + 21x

Solving
8 + 18x = -7 + 21x

Solving for variable 'x'.

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

Add '-21x' to each side of the equation.
8 + 18x + -21x = -7 + 21x + -21x

Combine like terms: 18x + -21x = -3x
8 + -3x = -7 + 21x + -21x

Combine like terms: 21x + -21x = 0
8 + -3x = -7 + 0
8 + -3x = -7

Add '-8' to each side of the equation.
8 + -8 + -3x = -7 + -8

Combine like terms: 8 + -8 = 0
0 + -3x = -7 + -8
-3x = -7 + -8

Combine like terms: -7 + -8 = -15
-3x = -15

Divide each side by '-3'.
x = 5

Simplifying
x = 5

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