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7(3-x)+2x=0
We simplify the equation to the form, which is simple to understand
7(3-x)+2x=0
Reorder the terms in parentheses
+(+21-7x)+2x=0
Remove unnecessary parentheses
+21-7x+2x=0
We move all terms containing x to the left and all other terms to the right.
-7x+2x=0-21
We simplify left and right side of the equation.
-5x=-21
We divide both sides of the equation by -5 to get x.
x=4.2
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