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a-(-7)=5
We simplify the equation to the form, which is simple to understand
a-(-7)=5
Remove unnecessary parentheses
a+7=5
We move all terms containing a to the left and all other terms to the right.
+1a=+5-7
We simplify left and right side of the equation.
+1a=-2
We divide both sides of the equation by 1 to get a.
a=-2
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