They're asking you to find a value for x, which in this case is 4, since 3 times 4 equals 12.
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3x+42=6x+12 42=6x-3x+12 42=3x+12 42-12=3x 30=3x 10=x
3x-4x=12 that means -x equals 12 so x equals -12
3x=12 3x/3=12/3 x=4
12
3x+8 = 12 3x = 4 x = 4/3