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x in (-oo:+oo)
(1/3)*x+50 = 6*(x+77) // - 6*(x+77)
(1/3)*x-(6*(x+77))+50 = 0
(1/3)*x-6*(x+77)+50 = 0
x/3-6*(x+77)+50 = 0
(-6*3*(x+77))/3+x/3+(3*50)/3 = 0
x-6*3*(x+77)+3*50 = 0
150-17*x-1386 = 0
-17*x-1236 = 0
(-17*x-1236)/3 = 0
(-17*x-1236)/3 = 0 // * 3
-17*x-1236 = 0
-17*x-1236 = 0 // + 1236
-17*x = 1236 // : -17
x = 1236/(-17)
x = -1236/17
x = -1236/17
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