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(4/5)*x+6/2 = (7/4)*x+57/20+3/4 // - (7/4)*x+57/20+3/4
(4/5)*x-((7/4)*x)+6/2-(57/20)-(3/4) = 0
(4/5)*x+(-7/4)*x+6/2-57/20-3/4 = 0
-19/20*x-3/5 = 0 // + 3/5
-19/20*x = 3/5 // : -19/20
x = 3/5/(-19/20)
x = -12/19
x = -12/19
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