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(1/3)*x-18 = 2*x-3 // - 2*x-3
(1/3)*x-(2*x)-18+3 = 0
(1/3)*x-2*x-18+3 = 0
-5/3*x-15 = 0 // + 15
-5/3*x = 15 // : -5/3
x = 15/(-5/3)
x = -9
x = -9
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