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x in (-oo:+oo)
75 = (1/2)*(17*x+17*x-360) // - (1/2)*(17*x+17*x-360)
75-((1/2)*(17*x+17*x-360)) = 0
(-1/2)*(17*x+17*x-360)+75 = 0
75-1/2*(34*x-360) = 0
75-1/2*(34*x-360) = 0
255-17*x = 0
255-17*x = 0
255-17*x = 0 // - 255
-17*x = -255 // : -17
x = -255/(-17)
x = 15
x = 15
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