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