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21(x/3)+21(x/7)=56
We simplify the equation to the form, which is simple to understand
21(x/3)+21(x/7)=56
Reorder the terms in parentheses
+(+7x)+21*( + 0.14285714285714x)=56
Remove unnecessary parentheses
+7x+21+*( + 0.14285714285714x+)=+56
Reorder the terms in parentheses
+7x+(+3x)=56
Remove unnecessary parentheses
+7x+3x=+56
We move all terms containing x to the left and all other terms to the right.
+7x+3x=+56
We simplify left and right side of the equation.
+10x=+56
We divide both sides of the equation by 10 to get x.
x=5.6
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