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(2/3)*(x-4) = -18 // + 18
(2/3)*(x-4)+18 = 0
2/3*(x-4)+18 = 0
2/3*(x-4)+18 = 0
2/3*x+46/3 = 0
2/3*x+46/3 = 0
2/3*x+46/3 = 0 // - 46/3
2/3*x = -46/3 // : 2/3
x = -46/3/2/3
x = -23
x = -23
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