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7-3x=-21
We simplify the equation to the form, which is simple to understand
7-3x=-21
We move all terms containing x to the left and all other terms to the right.
-3x=-21-7
We simplify left and right side of the equation.
-3x=-28
We divide both sides of the equation by -3 to get x.
x=9.33333333333
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