21x+12=9x+7

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Solution for 21x+12=9x+7 equation:


Simplifying
21x + 12 = 9x + 7

Reorder the terms:
12 + 21x = 9x + 7

Reorder the terms:
12 + 21x = 7 + 9x

Solving
12 + 21x = 7 + 9x

Solving for variable 'x'.

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

Add '-9x' to each side of the equation.
12 + 21x + -9x = 7 + 9x + -9x

Combine like terms: 21x + -9x = 12x
12 + 12x = 7 + 9x + -9x

Combine like terms: 9x + -9x = 0
12 + 12x = 7 + 0
12 + 12x = 7

Add '-12' to each side of the equation.
12 + -12 + 12x = 7 + -12

Combine like terms: 12 + -12 = 0
0 + 12x = 7 + -12
12x = 7 + -12

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

Divide each side by '12'.
x = -0.4166666667

Simplifying
x = -0.4166666667

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