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x in (-oo:+oo)
(1/5)*(25-(15*x))+16 = 30 // - 30
(1/5)*(25-(15*x))-30+16 = 0
(1/5)*(25-15*x)-30+16 = 0
1/5*(25-15*x)-30+16 = 0
1/5*(25-15*x)-30+16 = 0
16-3*x-25 = 0
-3*x-9 = 0
-3*x-9 = 0
-3*x-9 = 0 // + 9
-3*x = 9 // : -3
x = 9/(-3)
x = -3
x = -3
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