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x in (-oo:+oo)
5*x+1/2 = 7*x+19/10 // - 7*x+19/10
5*x-(7*x)+1/2-(19/10) = 0
5*x-7*x+1/2-19/10 = 0
-2*x-7/5 = 0 // + 7/5
-2*x = 7/5 // : -2
x = 7/5/(-2)
x = -7/10
x = -7/10
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