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2a+(3a-7)=0
We simplify the equation to the form, which is simple to understand
2a+(3a-7)=0
Remove unnecessary parentheses
+2a+3a-7=0
We move all terms containing a to the left and all other terms to the right.
+2a+3a=0+7
We simplify left and right side of the equation.
+5a=+7
We divide both sides of the equation by 5 to get a.
a=1.4
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