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(9/4)*x = 2*x+10 // - 2*x+10
(9/4)*x-(2*x)-10 = 0
(9/4)*x-2*x-10 = 0
1/4*x-10 = 0 // + 10
1/4*x = 10 // : 1/4
x = 10/1/4
x = 40
x = 40
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