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4a+2-7a-5=0
We simplify the equation to the form, which is simple to understand
4a+2-7a-5=0
We move all terms containing a to the left and all other terms to the right.
+4a-7a=0-2+5
We simplify left and right side of the equation.
-3a=+3
We divide both sides of the equation by -3 to get a.
a=-1
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