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x in (-oo:+oo)
26 = 7*x-x-10 // - 7*x-x-10
x-(7*x)+10+26 = 0
x-7*x+10+26 = 0
36-6*x = 0 // - 36
-6*x = -36 // : -6
x = -36/(-6)
x = 6
x = 6
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