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(3/4)*x+(5/2)*x+7/3+5 = 7 // - 7
(3/4)*x+(5/2)*x+7/3-7+5 = 0
13/4*x+1/3 = 0 // - 1/3
13/4*x = -1/3 // : 13/4
x = -1/3/13/4
x = -4/39
x = -4/39
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