(12у+z)/y=0.4
(12y/y)+z/y=0.4
z/y=-12+0.4=-11.6
(t-7z)/z=18
(t/z)-7z/z=18
t/z=18+7=25
(2t+z)/z=(2t/z)+z/z=2*25+1=51
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(12у+z)/y=0.4
(12y/y)+z/y=0.4
z/y=-12+0.4=-11.6
(t-7z)/z=18
(t/z)-7z/z=18
t/z=18+7=25
(2t+z)/z=(2t/z)+z/z=2*25+1=51