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45/5 = 4*x-2*3 // - 4*x-2*3
45/5-(4*x)-(-2*3) = 0
45/5-4*x+6 = 0
15-4*x = 0 // - 15
-4*x = -15 // : -4
x = -15/(-4)
x = 15/4
x = 15/4
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