21x-5=15x+7

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Solution for 21x-5=15x+7 equation:


Simplifying
21x + -5 = 15x + 7

Reorder the terms:
-5 + 21x = 15x + 7

Reorder the terms:
-5 + 21x = 7 + 15x

Solving
-5 + 21x = 7 + 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.
-5 + 21x + -15x = 7 + 15x + -15x

Combine like terms: 21x + -15x = 6x
-5 + 6x = 7 + 15x + -15x

Combine like terms: 15x + -15x = 0
-5 + 6x = 7 + 0
-5 + 6x = 7

Add '5' to each side of the equation.
-5 + 5 + 6x = 7 + 5

Combine like terms: -5 + 5 = 0
0 + 6x = 7 + 5
6x = 7 + 5

Combine like terms: 7 + 5 = 12
6x = 12

Divide each side by '6'.
x = 2

Simplifying
x = 2

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