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21=7(1+x)+7(2+4x)
We simplify the equation to the form, which is simple to understand
21=7(1+x)+7(2+4x)
Reorder the terms in parentheses
21=+(+7+7x)+7*(2+4x)
Remove unnecessary parentheses
+21=+7+7x+7+*(+2+4x+)
Reorder the terms in parentheses
21=+7+7x+(+14+28x)
Remove unnecessary parentheses
+21=+7+7x+14+28x
We move all terms containing x to the left and all other terms to the right.
-7x-28x=+7+14-21
We simplify left and right side of the equation.
-35x=0
We divide both sides of the equation by -35 to get x.
x=-0
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