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4a-3a+15=-7
We simplify the equation to the form, which is simple to understand
4a-3a+15=-7
We move all terms containing a to the left and all other terms to the right.
+4a-3a=-7-15
We simplify left and right side of the equation.
+1a=-22
We divide both sides of the equation by 1 to get a.
a=-22
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