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x in (-oo:+oo)
(1/8)*(x+6) = 10 // - 10
(1/8)*(x+6)-10 = 0
1/8*(x+6)-10 = 0
1/8*(x+6)-10 = 0
1/8*x-37/4 = 0
1/8*x-37/4 = 0
1/8*x-37/4 = 0 // + 37/4
1/8*x = 37/4 // : 1/8
x = 37/4/1/8
x = 74
x = 74
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