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-7x+7=-4x+31
We simplify the equation to the form, which is simple to understand
-7x+7=-4x+31
We move all terms containing x to the left and all other terms to the right.
-7x+4x=+31-7
We simplify left and right side of the equation.
-3x=+24
We divide both sides of the equation by -3 to get x.
x=-8
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