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-5a-25=5(-2a+4)-4a
We simplify the equation to the form, which is simple to understand
-5a-25=5(-2a+4)-4a
Reorder the terms in parentheses
-5a-25=+(-10a+20)-4a
Remove unnecessary parentheses
-5a-25=-10a+20-4a
We move all terms containing a to the left and all other terms to the right.
-5a+10a+4a=+20+25
We simplify left and right side of the equation.
+9a=+45
We divide both sides of the equation by 9 to get a.
a=5
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