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12a+45=90
We simplify the equation to the form, which is simple to understand
12a+45=90
We move all terms containing a to the left and all other terms to the right.
+12a=+90-45
We simplify left and right side of the equation.
+12a=+45
We divide both sides of the equation by 12 to get a.
a=3.75
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