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7a-(4a+5)=0
We simplify the equation to the form, which is simple to understand
7a-(4a+5)=0
Remove unnecessary parentheses
7a-4a-5=0
We move all terms containing a to the left and all other terms to the right.
+7a-4a=0+5
We simplify left and right side of the equation.
+3a=+5
We divide both sides of the equation by 3 to get a.
a=1.6666666666667
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