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x in (-oo:+oo)
x/5-(7/4) = 15/10 // - 15/10
x/5-(7/4)-(15/10) = 0
x/5-7/4-3/2 = 0
1/5*x-13/4 = 0 // + 13/4
1/5*x = 13/4 // : 1/5
x = 13/4/1/5
x = 65/4
x = 65/4
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