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x in (-oo:+oo)
(5/3)*x+7 = (4/5)*x-3 // - (4/5)*x-3
(5/3)*x-((4/5)*x)+3+7 = 0
(5/3)*x+(-4/5)*x+3+7 = 0
13/15*x+10 = 0 // - 10
13/15*x = -10 // : 13/15
x = -10/13/15
x = -150/13
x = -150/13
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