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x in (-oo:+oo)
(-3/5)*x+2 = 7 // - 7
(-3/5)*x-7+2 = 0
-3/5*x-5 = 0 // + 5
-3/5*x = 5 // : -3/5
x = 5/(-3/5)
x = -25/3
x = -25/3
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