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x in (-oo:+oo)
6*(x/6) = 4*x-270 // - 4*x-270
6*(x/6)-(4*x)+270 = 0
6*(x/6)-4*x+270 = 0
270-3*x = 0 // - 270
-3*x = -270 // : -3
x = -270/(-3)
x = 90
x = 90
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