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x in (-oo:+oo)
(1/3)*(x-2)+1 = (2*x)/7 // - (2*x)/7
(1/3)*(x-2)-((2*x)/7)+1 = 0
(1/3)*(x-2)+(-2/7)*x+1 = 0
1/3*(x-2)+(-2*x)/7+1 = 0
(1/3*7*(x-2))/7+(-2*x)/7+(1*7)/7 = 0
1/3*7*(x-2)-2*x+1*7 = 0
1/3*x-14/3+7 = 0
1/3*x+7/3 = 0
(1/3*x+7/3)/7 = 0
(1/3*x+7/3)/7 = 0 // * 7
1/3*x+7/3 = 0
1/3*x+7/3 = 0 // - 7/3
1/3*x = -7/3 // : 1/3
x = -7/3/1/3
x = -7
x = -7
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