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(51/5)-(57/10)=a
We simplify the equation to the form, which is simple to understand
(51/5)-(57/10)=a
Remove unnecessary parentheses
+10.2-(+5.7)=a
Remove unnecessary parentheses
+10.2-5.7=a
We move all terms containing a to the left and all other terms to the right.
-1a=-10.2+5.7
We simplify left and right side of the equation.
-1a=-4.5
We divide both sides of the equation by -01 to get a.
a=4.5
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