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(.2)87+(.2)89+(.2)76+(.2)77+(.2)x=80
We simplify the equation to the form, which is simple to understand
(.2)87+(.2)89+(.2)76+(.2)77+(.2)x=80
We move all terms containing x to the left and all other terms to the right.
+1x=+80-0-0-87-0-0-89-0-0-76-0-0-77-0-0
We simplify left and right side of the equation.
+1x=-249
We divide both sides of the equation by 1 to get x.
x=-249
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