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(5*x^1)/2 = 45 // - 45
(5*x^1)/2-45 = 0
(5*x)/2-45 = 0
5/2*x-45 = 0 // + 45
5/2*x = 45 // : 5/2
x = 45/5/2
x = 18
x = 18
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