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x in (-oo:+oo)
(2*x-16)/2-((2*x-26)/4) = 21 // - 21
(2*x-16)/2-((2*x-26)/4)-21 = 0
(2*x-16)/2+(-1*(2*x-26))/4-21 = 0
(4*(2*x-16))/(2*4)+(-1*2*(2*x-26))/(2*4)+(-21*2*4)/(2*4) = 0
4*(2*x-16)-1*2*(2*x-26)-21*2*4 = 0
4*x-168-12 = 0
4*x-180 = 0
(4*x-180)/(2*4) = 0
(4*x-180)/(2*4) = 0 // * 2*4
4*x-180 = 0
4*x-180 = 0 // + 180
4*x = 180 // : 4
x = 180/4
x = 45
x = 45
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