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-40*x-120 = 4*(2/5) // - 4*(2/5)
-40*x-(4*(2/5))-120 = 0
-40*x-8/5-120 = 0
-40*x-608/5 = 0 // + 608/5
-40*x = 608/5 // : -40
x = 608/5/(-40)
x = -76/25
x = -76/25
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