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(3a-5)=40
We simplify the equation to the form, which is simple to understand
(3a-5)=40
Remove unnecessary parentheses
3a-5=40
We move all terms containing a to the left and all other terms to the right.
+3a=+40+5
We simplify left and right side of the equation.
+3a=+45
We divide both sides of the equation by 3 to get a.
a=15
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