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a+35=-3(7a+3)
We simplify the equation to the form, which is simple to understand
a+35=-3(7a+3)
Reorder the terms in parentheses
a+35=+(-21a-9)
Remove unnecessary parentheses
+a+35=-21a-9
We move all terms containing a to the left and all other terms to the right.
+1a+21a=-9-35
We simplify left and right side of the equation.
+22a=-44
We divide both sides of the equation by 22 to get a.
a=-2
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