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x in (-oo:+oo)
3/90 = (7/4)*x // - (7/4)*x
3/90-((7/4)*x) = 0
(-7/4)*x+3/90 = 0
1/30-7/4*x = 0 // - 1/30
-7/4*x = -1/30 // : -7/4
x = -1/30/(-7/4)
x = 2/105
x = 2/105
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