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21=2(1+2x)-5(x-5)
We simplify the equation to the form, which is simple to understand
21=2(1+2x)-5(x-5)
Reorder the terms in parentheses
21=+(+2+4x)-5*(x-5)
Remove unnecessary parentheses
+21=+2+4x-5+*(+x-5+)
Reorder the terms in parentheses
21=+2+4x+(-5x+25)
Remove unnecessary parentheses
+21=+2+4x-5x+25
We move all terms containing x to the left and all other terms to the right.
-4x+5x=+2+25-21
We simplify left and right side of the equation.
+1x=+6
We divide both sides of the equation by 1 to get x.
x=6
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