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x in (-oo:+oo)
-(4-x) = (3/4)*(x-6) // - (3/4)*(x-6)
x-((3/4)*(x-6))-4 = 0
(-3/4)*(x-6)+x-4 = 0
x-3/4*(x-6)-4 = 0
x-3/4*(x-6)-4 = 0
1/4*x-4+9/2 = 0
1/4*x+1/2 = 0
1/4*x+1/2 = 0
1/4*x+1/2 = 0 // - 1/2
1/4*x = -1/2 // : 1/4
x = -1/2/1/4
x = -2
x = -2
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