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x in (-oo:+oo)
(3/2)*(2*x+3) = -21 // + 21
(3/2)*(2*x+3)+21 = 0
3/2*(2*x+3)+21 = 0
3/2*(2*x+3)+21 = 0
3*x+51/2 = 0
3*x+51/2 = 0
3*x+51/2 = 0 // - 51/2
3*x = -51/2 // : 3
x = -51/2/3
x = -17/2
x = -17/2
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