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