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x in (-oo:+oo)
x/5-(y/4) = 71/10 // - 71/10
x/5-(y/4)-(71/10) = 0
x/5-(y/4)-71/10 = 0
1/5*x-1/4*y-71/10 = 0 // + -1/4*y-71/10
1/5*x = -(-1/4*y-71/10) // : 1/5
x = (-(-1/4*y-71/10))/1/5
x = 5*(71/10-(-1/4*y))
x = 5*(71/10-(-1/4*y))
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