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x in (-oo:+oo)
7*x+2 = -29/10 // + -29/10
7*x-(-29/10)+2 = 0
7*x+29/10+2 = 0
7*x+49/10 = 0 // - 49/10
7*x = -49/10 // : 7
x = -49/10/7
x = -7/10
x = -7/10
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