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X in (-oo:+oo)
X/3-(7/10) = -1/5 // + -1/5
X/3-(7/10)-(-1/5) = 0
X/3-7/10+1/5 = 0
1/3*X-1/2 = 0 // + 1/2
1/3*X = 1/2 // : 1/3
X = 1/2/1/3
X = 3/2
X = 3/2
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