21x+7=9x-17

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Solution for 21x+7=9x-17 equation:


Simplifying
21x + 7 = 9x + -17

Reorder the terms:
7 + 21x = 9x + -17

Reorder the terms:
7 + 21x = -17 + 9x

Solving
7 + 21x = -17 + 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.
7 + 21x + -9x = -17 + 9x + -9x

Combine like terms: 21x + -9x = 12x
7 + 12x = -17 + 9x + -9x

Combine like terms: 9x + -9x = 0
7 + 12x = -17 + 0
7 + 12x = -17

Add '-7' to each side of the equation.
7 + -7 + 12x = -17 + -7

Combine like terms: 7 + -7 = 0
0 + 12x = -17 + -7
12x = -17 + -7

Combine like terms: -17 + -7 = -24
12x = -24

Divide each side by '12'.
x = -2

Simplifying
x = -2

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