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-3a(-7+3)-(-5+9)=-9a(-3-7)
We simplify the equation to the form, which is simple to understand
-3a(-7+3)-(-5+9)=-9a(-3-7)
Simplifying terms in parentheses
-3a*(-4)-(-5+9)=-9a*(-3-7)
Simplifying terms in parentheses
-3a*(-4)-(+4)=-9a*(-3-7)
Simplifying terms in parentheses
-3a*(-4)-(+4)=-9a*(-10)
Reorder the terms in parentheses
+(+12a)-(+4)=-9a*(-10)
Remove unnecessary parentheses
+12a-(+4+)=-9a+*(-10+)
Remove unnecessary parentheses
+12a-4=-9a*(-10)
Reorder the terms in parentheses
+12a-4=+(+90a)
Remove unnecessary parentheses
+12a-4=+90a
We move all terms containing a to the left and all other terms to the right.
+12a-90a=+4
We simplify left and right side of the equation.
-78a=+4
We divide both sides of the equation by -78 to get a.
a=-0.0512820512821
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