30 + 42 = 72
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3x+42=6x+12 42=6x-3x+12 42=3x+12 42-12=3x 30=3x 10=x
30 + 12 = 42, 12 + 12 = 24, I am not completely sure on the answer as the two subtractions can be taken in either order, either resulting in: 42 - 24 + 18, 18 - 12 = 6, or 24 - 12 = 12, 42 - 12 = 30.
If: k/2 + 9 = 30 Then: k = 42
42/30 = 1.4 = 140 %
42-3x10+2 first you do multiplycation42-30+2 now you do subtraction12+2 lastly, you subtract14 your answer is 14