1-3x=4+8

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Solution for 1-3x=4+8 equation: 


Simplifying
1 + -3x = 4 + 8

Combine like terms: 4 + 8 = 12
1 + -3x = 12

Solving
1 + -3x = 12

Solving for variable 'x'.

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

Add '-1' to each side of the equation.
1 + -1 + -3x = 12 + -1

Combine like terms: 1 + -1 = 0
0 + -3x = 12 + -1
-3x = 12 + -1

Combine like terms: 12 + -1 = 11
-3x = 11

Divide each side by '-3'.
x = -3.666666667

Simplifying
x = -3.666666667

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