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x in (-oo:+oo)
(x-3)/7 = 5/4 // - 5/4
(x-3)/7-(5/4) = 0
(x-3)/7-5/4 = 0
(4*(x-3))/(4*7)+(-5*7)/(4*7) = 0
4*(x-3)-5*7 = 0
4*x-47 = 0
(4*x-47)/(4*7) = 0
(4*x-47)/(4*7) = 0 // * 4*7
4*x-47 = 0
4*x-47 = 0 // + 47
4*x = 47 // : 4
x = 47/4
x = 47/4
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