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x in (-oo:+oo)
7-(35*x) = 2*(x/2) // - 2*(x/2)
7-(35*x)-(2*(x/2)) = 0
7-35*x-x = 0
7-36*x = 0 // - 7
-36*x = -7 // : -36
x = -7/(-36)
x = 7/36
x = 7/36
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