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x in (-oo:+oo)
5*(x/2) = 7*x+4 // - 7*x+4
5*(x/2)-(7*x)-4 = 0
5*(x/2)-7*x-4 = 0
-9/2*x-4 = 0 // + 4
-9/2*x = 4 // : -9/2
x = 4/(-9/2)
x = -8/9
x = -8/9
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