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x in (-oo:+oo)
(-3/2)*(x-2) = 21 // - 21
(-3/2)*(x-2)-21 = 0
-3/2*(x-2)-21 = 0
-3/2*(x-2)-21 = 0
-3/2*x-18 = 0
-3/2*x-18 = 0
-3/2*x-18 = 0 // + 18
-3/2*x = 18 // : -3/2
x = 18/(-3/2)
x = -12
x = -12
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