123-3x=15x+21

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Solution for 123-3x=15x+21 equation:


Simplifying
123 + -3x = 15x + 21

Reorder the terms:
123 + -3x = 21 + 15x

Solving
123 + -3x = 21 + 15x

Solving for variable 'x'.

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

Add '-15x' to each side of the equation.
123 + -3x + -15x = 21 + 15x + -15x

Combine like terms: -3x + -15x = -18x
123 + -18x = 21 + 15x + -15x

Combine like terms: 15x + -15x = 0
123 + -18x = 21 + 0
123 + -18x = 21

Add '-123' to each side of the equation.
123 + -123 + -18x = 21 + -123

Combine like terms: 123 + -123 = 0
0 + -18x = 21 + -123
-18x = 21 + -123

Combine like terms: 21 + -123 = -102
-18x = -102

Divide each side by '-18'.
x = 5.666666667

Simplifying
x = 5.666666667

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