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x in (-oo:+oo)
3*x+4 = (7*x)/5 // - (7*x)/5
3*x-((7*x)/5)+4 = 0
3*x+(-7/5)*x+4 = 0
8/5*x+4 = 0 // - 4
8/5*x = -4 // : 8/5
x = -4/8/5
x = -5/2
x = -5/2
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