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x in (-oo:+oo)
(3/5)*x+1/7 = -20/7 // + -20/7
(3/5)*x+1/7-(-20/7) = 0
(3/5)*x+1/7+20/7 = 0
3/5*x+3 = 0 // - 3
3/5*x = -3 // : 3/5
x = -3/3/5
x = -5
x = -5
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