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x in (-oo:+oo)
2.5 = x/7 // - x/7
2.5-(x/7) = 0
2.5-1/7*x = 0 // - 2.5
-1/7*x = -2.5 // : -1/7
x = -2.5/(-1/7)
x = 17.50000035
x = 17.50000035
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