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x in (-oo:+oo)
(-3/5)*x+(2/5)*x+7 = 19 // - 19
(-3/5)*x+(2/5)*x-19+7 = 0
-1/5*x-12 = 0 // + 12
-1/5*x = 12 // : -1/5
x = 12/(-1/5)
x = -60
x = -60
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