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(3/4)*x = 7.5-(0.75*x) // - 7.5-(0.75*x)
(3/4)*x+0.75*x-7.5 = 0
1.5*x-7.5 = 0 // + 7.5
1.5*x = 7.5 // : 1.5
x = 7.5/1.5
x = 5
x = 5
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