21x-15=18x-7

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Solution for 21x-15=18x-7 equation:


Simplifying
21x + -15 = 18x + -7

Reorder the terms:
-15 + 21x = 18x + -7

Reorder the terms:
-15 + 21x = -7 + 18x

Solving
-15 + 21x = -7 + 18x

Solving for variable 'x'.

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

Add '-18x' to each side of the equation.
-15 + 21x + -18x = -7 + 18x + -18x

Combine like terms: 21x + -18x = 3x
-15 + 3x = -7 + 18x + -18x

Combine like terms: 18x + -18x = 0
-15 + 3x = -7 + 0
-15 + 3x = -7

Add '15' to each side of the equation.
-15 + 15 + 3x = -7 + 15

Combine like terms: -15 + 15 = 0
0 + 3x = -7 + 15
3x = -7 + 15

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

Divide each side by '3'.
x = 2.666666667

Simplifying
x = 2.666666667

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