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0.7(4+2)-0.5(a-7)=0
We simplify the equation to the form, which is simple to understand
0.7(4+2)-0.5(a-7)=0
Reorder the terms in parentheses
+(+4.2)-0.5*(a-7)=0
Remove unnecessary parentheses
+4.2-0.5+*(+a-7+)=0
Reorder the terms in parentheses
+4.2+(-0.5a+3.5)=0
Remove unnecessary parentheses
+4.2-0.5a+3.5=0
We move all terms containing a to the left and all other terms to the right.
-0.5a=0-4.2-3.5
We simplify left and right side of the equation.
-0.5a=-7.7
We divide both sides of the equation by -0.5 to get a.
a=15.4
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