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(7/2)*x-3 = (2/5)*x-(3/4) // - (2/5)*x-(3/4)
(7/2)*x-((2/5)*x)+3/4-3 = 0
(7/2)*x+(-2/5)*x+3/4-3 = 0
31/10*x-9/4 = 0 // + 9/4
31/10*x = 9/4 // : 31/10
x = 9/4/31/10
x = 45/62
x = 45/62
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