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x in (-oo:+oo)
-(7*x)-5 = -40 // + 40
40-(7*x)-5 = 0
40-7*x-5 = 0
35-7*x = 0 // - 35
-7*x = -35 // : -7
x = -35/(-7)
x = 5
x = 5
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