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(1/7)*(3*y+4) = (1/5)*(y+3)+5 // - (1/5)*(y+3)+5
(1/7)*(3*y+4)-((1/5)*(y+3))-5 = 0
(1/7)*(3*y+4)+(-1/5)*(y+3)-5 = 0
1/7*(3*y+4)-1/5*(y+3)-5 = 0
1/7*(3*y+4)-1/5*(y+3)-5 = 0
8/35*y-5-1/35 = 0
8/35*y-176/35 = 0
8/35*y-176/35 = 0
8/35*y-176/35 = 0 // + 176/35
8/35*y = 176/35 // : 8/35
y = 176/35/8/35
y = 22
y = 22
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