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a=4-5(-.5)
We simplify the equation to the form, which is simple to understand
a=4-5(-.5)
Reorder the terms in parentheses
a=4+(+2.5)
Remove unnecessary parentheses
+a=+4+2.5
We move all terms containing a to the left and all other terms to the right.
+1a=+4+2.5
We simplify left and right side of the equation.
+1a=+6.5
We divide both sides of the equation by 1 to get a.
a=6.5
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