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x in (-oo:+oo)
43 = -x/7-8 // + -x/7-8
8-(-x/7)+43 = 0
(1/7)*x+8+43 = 0
1/7*x+51 = 0 // - 51
1/7*x = -51 // : 1/7
x = -51/1/7
x = -357
x = -357
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