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-266=3x+7(-7+4x)
We simplify the equation to the form, which is simple to understand
-266=3x+7(-7+4x)
Reorder the terms in parentheses
-266=3x+(-49+28x)
Remove unnecessary parentheses
-266=+3x-49+28x
We move all terms containing x to the left and all other terms to the right.
-3x-28x=-49+266
We simplify left and right side of the equation.
-31x=+217
We divide both sides of the equation by -31 to get x.
x=-7
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