2x+129=6x-21

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Solution for 2x+129=6x-21 equation:


Simplifying
2x + 129 = 6x + -21

Reorder the terms:
129 + 2x = 6x + -21

Reorder the terms:
129 + 2x = -21 + 6x

Solving
129 + 2x = -21 + 6x

Solving for variable 'x'.

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

Add '-6x' to each side of the equation.
129 + 2x + -6x = -21 + 6x + -6x

Combine like terms: 2x + -6x = -4x
129 + -4x = -21 + 6x + -6x

Combine like terms: 6x + -6x = 0
129 + -4x = -21 + 0
129 + -4x = -21

Add '-129' to each side of the equation.
129 + -129 + -4x = -21 + -129

Combine like terms: 129 + -129 = 0
0 + -4x = -21 + -129
-4x = -21 + -129

Combine like terms: -21 + -129 = -150
-4x = -150

Divide each side by '-4'.
x = 37.5

Simplifying
x = 37.5

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