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x in (-oo:+oo)
4*(10-5*x) = -60 // + 60
4*(10-5*x)+60 = 0
4*(10-5*x)+60 = 0
100-20*x = 0
100-20*x = 0
100-20*x = 0 // - 100
-20*x = -100 // : -20
x = -100/(-20)
x = 5
x = 5
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