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x in (-oo:+oo)
25-((4/10)*x) = 7 // - 7
25-((4/10)*x)-7 = 0
(-2/5)*x-7+25 = 0
18-2/5*x = 0 // - 18
-2/5*x = -18 // : -2/5
x = -18/(-2/5)
x = 45
x = 45
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