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x in (-oo:+oo)
1 = (3/7)*x+4 // - (3/7)*x+4
1-((3/7)*x)-4 = 0
(-3/7)*x-4+1 = 0
-3/7*x-3 = 0 // + 3
-3/7*x = 3 // : -3/7
x = 3/(-3/7)
x = -7
x = -7
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