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