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x+.8*420=.7/.1(x+420)
We simplify the equation to the form, which is simple to understand
x+.8*420=.7/.1(x+420)
Simplifying:
x+336=.7/.1*(x+420)
Simplifying:
x+336=+7*(x+420)
Reorder the terms in parentheses
x+336=+(+7x+2940)
Remove unnecessary parentheses
+x+336=+7x+2940
We move all terms containing x to the left and all other terms to the right.
+1x-7x=+2940-336
We simplify left and right side of the equation.
-6x=+2604
We divide both sides of the equation by -6 to get x.
x=-434
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