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6*((20*x)/9+15) = -150 // + 150
6*((20*x)/9+15)+150 = 0
6*(20/9*x+15)+150 = 0
6*(20/9*x+15)+150 = 0
40/3*x+240 = 0
40/3*x+240 = 0
40/3*x+240 = 0 // - 240
40/3*x = -240 // : 40/3
x = -240/40/3
x = -18
x = -18
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