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x in (-oo:+oo)
35 = -x/7-12 // + -x/7-12
12-(-x/7)+35 = 0
(1/7)*x+12+35 = 0
1/7*x+47 = 0 // - 47
1/7*x = -47 // : 1/7
x = -47/1/7
x = -329
x = -329
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