129=7x+5x+3

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Solution for 129=7x+5x+3 equation:


Simplifying
129 = 7x + 5x + 3

Reorder the terms:
129 = 3 + 7x + 5x

Combine like terms: 7x + 5x = 12x
129 = 3 + 12x

Solving
129 = 3 + 12x

Solving for variable 'x'.

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

Add '-12x' to each side of the equation.
129 + -12x = 3 + 12x + -12x

Combine like terms: 12x + -12x = 0
129 + -12x = 3 + 0
129 + -12x = 3

Add '-129' to each side of the equation.
129 + -129 + -12x = 3 + -129

Combine like terms: 129 + -129 = 0
0 + -12x = 3 + -129
-12x = 3 + -129

Combine like terms: 3 + -129 = -126
-12x = -126

Divide each side by '-12'.
x = 10.5

Simplifying
x = 10.5

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