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0.8y+200=100
We simplify the equation to the form, which is simple to understand
0.8y+200=100
We move all terms containing y to the left and all other terms to the right.
+ 0.8y=+100-200
We simplify left and right side of the equation.
+ 0.8y=-100
We divide both sides of the equation by 0.8 to get y.
y=-125
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