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2a-(-10)-4a+7=29
We simplify the equation to the form, which is simple to understand
2a-(-10)-4a+7=29
Remove unnecessary parentheses
2a+10-4a+7=29
We move all terms containing a to the left and all other terms to the right.
+2a-4a=+29-10-7
We simplify left and right side of the equation.
-2a=+12
We divide both sides of the equation by -2 to get a.
a=-6
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