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(7/4)*x+(1/2)*x = 57/8 // - 57/8
(7/4)*x+(1/2)*x-(57/8) = 0
(7/4)*x+(1/2)*x-57/8 = 0
9/4*x-57/8 = 0 // + 57/8
9/4*x = 57/8 // : 9/4
x = 57/8/9/4
x = 19/6
x = 19/6
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