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x in (-oo:+oo)
25-((1/5)*x) = 18 // - 18
25-((1/5)*x)-18 = 0
(-1/5)*x-18+25 = 0
7-1/5*x = 0 // - 7
-1/5*x = -7 // : -1/5
x = -7/(-1/5)
x = 35
x = 35
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