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x+x+(3/4)*x+(3/4)*x = 60 // - 60
x+x+(3/4)*x+(3/4)*x-60 = 0
7/2*x-60 = 0 // + 60
7/2*x = 60 // : 7/2
x = 60/7/2
x = 120/7
x = 120/7
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