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3=a(3-0)-4
We simplify the equation to the form, which is simple to understand
3=a(3-0)-4
Reorder the terms in parentheses
3=+(-0a+3a)-4
Remove unnecessary parentheses
+3=+3a-4
We move all terms containing a to the left and all other terms to the right.
-3a=-4-3
We simplify left and right side of the equation.
-3a=-7
We divide both sides of the equation by -03 to get a.
a=2.3333333333333
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