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-7a+10=87
We simplify the equation to the form, which is simple to understand
-7a+10=87
We move all terms containing a to the left and all other terms to the right.
-7a=+87-10
We simplify left and right side of the equation.
-7a=+77
We divide both sides of the equation by -7 to get a.
a=-11
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