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3*(x+2)=21-x
We simplify the equation to the form, which is simple to understand
3*(x+2)=21-x
Reorder the terms in parentheses
+(+3x+6)=21-x
Remove unnecessary parentheses
+3x+6=+21-x
We move all terms containing x to the left and all other terms to the right.
+3x+1x=+21-6
We simplify left and right side of the equation.
+4x=+15
We divide both sides of the equation by 4 to get x.
x=3.75
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