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x in (-oo:+oo)
(5*x)/2+7 = 2*x+4 // - 2*x+4
(5*x)/2-(2*x)-4+7 = 0
(5*x)/2-2*x-4+7 = 0
1/2*x+3 = 0 // - 3
1/2*x = -3 // : 1/2
x = -3/1/2
x = -6
x = -6
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