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(7/4)*x-((4/5)*x) = 19/80 // - 19/80
(7/4)*x-((4/5)*x)-(19/80) = 0
(7/4)*x+(-4/5)*x-19/80 = 0
19/20*x-19/80 = 0 // + 19/80
19/20*x = 19/80 // : 19/20
x = 19/80/19/20
x = 1/4
x = 1/4
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