3x+9+3=x+4x-8

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Solution for 3x+9+3=x+4x-8 equation:


Simplifying
3x + 9 + 3 = x + 4x + -8

Reorder the terms:
9 + 3 + 3x = x + 4x + -8

Combine like terms: 9 + 3 = 12
12 + 3x = x + 4x + -8

Reorder the terms:
12 + 3x = -8 + x + 4x

Combine like terms: x + 4x = 5x
12 + 3x = -8 + 5x

Solving
12 + 3x = -8 + 5x

Solving for variable 'x'.

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

Add '-5x' to each side of the equation.
12 + 3x + -5x = -8 + 5x + -5x

Combine like terms: 3x + -5x = -2x
12 + -2x = -8 + 5x + -5x

Combine like terms: 5x + -5x = 0
12 + -2x = -8 + 0
12 + -2x = -8

Add '-12' to each side of the equation.
12 + -12 + -2x = -8 + -12

Combine like terms: 12 + -12 = 0
0 + -2x = -8 + -12
-2x = -8 + -12

Combine like terms: -8 + -12 = -20
-2x = -20

Divide each side by '-2'.
x = 10

Simplifying
x = 10

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