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3*(42*y-(5*y)+5/3) = 3*142 // - 3*142
3*(42*y-(5*y)+5/3)-(3*142) = 0
3*(42*y-5*y+5/3)-426 = 0
3*(37*y+5/3)-426 = 0
3*(37*y+5/3)-426 = 0
111*y-421 = 0
111*y-421 = 0
111*y-421 = 0 // + 421
111*y = 421 // : 111
y = 421/111
y = 421/111
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