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x in (-oo:+oo)
-2.5 = x/7+10.3 // - x/7+10.3
-(x/7)-10.3-2.5 = 0
-1/7*x-12.8 = 0 // + 12.8
-1/7*x = 12.8 // : -1/7
x = 12.8/(-1/7)
x = -89.60000179
x = -89.60000179
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