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y in (-oo:+oo)
(3*y-7)/4 = (4*y-84)/3 // - (4*y-84)/3
(3*y-7)/4-((4*y-84)/3) = 0
(3*y-7)/4+(-1*(4*y-84))/3 = 0
(3*(3*y-7))/(3*4)+(-1*4*(4*y-84))/(3*4) = 0
3*(3*y-7)-1*4*(4*y-84) = 0
315-7*y = 0
(315-7*y)/(3*4) = 0
(315-7*y)/(3*4) = 0 // * 3*4
315-7*y = 0
315-7*y = 0 // - 315
-7*y = -315 // : -7
y = -315/(-7)
y = 45
y = 45
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