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10a-15-6a+11=-7
We simplify the equation to the form, which is simple to understand
10a-15-6a+11=-7
We move all terms containing a to the left and all other terms to the right.
+10a-6a=-7+15-11
We simplify left and right side of the equation.
+4a=-3
We divide both sides of the equation by 4 to get a.
a=-0.75
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