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21x-7(-5x)=28
We simplify the equation to the form, which is simple to understand
21x-7(-5x)=28
Reorder the terms in parentheses
21x+(+35x)=28
Remove unnecessary parentheses
+21x+35x=+28
We move all terms containing x to the left and all other terms to the right.
+21x+35x=+28
We simplify left and right side of the equation.
+56x=+28
We divide both sides of the equation by 56 to get x.
x=0.5
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