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-129=6x-(-7x-1)
We simplify the equation to the form, which is simple to understand
-129=6x-(-7x-1)
Remove unnecessary parentheses
-129=6x+7x+1
We move all terms containing x to the left and all other terms to the right.
-6x-7x=+1+129
We simplify left and right side of the equation.
-13x=+130
We divide both sides of the equation by -13 to get x.
x=-10
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