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50-((2/5)*x) = -70 // + 70
50-((2/5)*x)+70 = 0
(-2/5)*x+50+70 = 0
120-2/5*x = 0 // - 120
-2/5*x = -120 // : -2/5
x = -120/(-2/5)
x = 300
x = 300
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