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x in (-oo:+oo)
2 = (1/7)*(x-7) // - (1/7)*(x-7)
2-((1/7)*(x-7)) = 0
(-1/7)*(x-7)+2 = 0
2-1/7*(x-7) = 0
2-1/7*(x-7) = 0
3-1/7*x = 0
3-1/7*x = 0
3-1/7*x = 0 // - 3
-1/7*x = -3 // : -1/7
x = -3/(-1/7)
x = 21
x = 21
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