c×d=0
c×d=3x-12
3x-12=0
3x=12
x=4
3×4-12=0
12-12=0
При x=4
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c×d=0
c×d=3x-12
3x-12=0
3x=12
x=4
3×4-12=0
12-12=0
c×d=0
При x=4