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a=400+(-80)(1-1)
We simplify the equation to the form, which is simple to understand
a=400+(-80)*(1-1)
Simplifying terms in parentheses
a=400+(-80)*()
Reorder the terms in parentheses
multiplication of parentheses
a=400+()
Remove unnecessary parentheses
+a=+400
We move all terms containing a to the left and all other terms to the right.
+1a=+400
We simplify left and right side of the equation.
+1a=+400
We divide both sides of the equation by 1 to get a.
a=400
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