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a=28+(-3)
We simplify the equation to the form, which is simple to understand
a=28+(-3)
Remove unnecessary parentheses
+a=+28-3
We move all terms containing a to the left and all other terms to the right.
+1a=+28-3
We simplify left and right side of the equation.
+1a=+25
We divide both sides of the equation by 1 to get a.
a=25
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