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the answer is 14. 28/14 = 2 42/14 = 3 70/14 = 5
3X - 4 = 66 add 4 to each side 3X - 4 + 4 = 66 + 4 3X = 70 divide each sides integers by 3 (3/3)X = 70/3 X = 70/3 ------------------check in original equation 3(70/3) - 4 = 66 210/3 - 4 = 66 70 - 4 = 66 66 = 66 ---------------checks ( naturally, you could have canceled here, 3(70/3) and just got 70 )
Use a factor tree. 70 Divide by two. 35,2 Divide by five. 7,5,2 Stop. All the factors are prime. 2 x 5 x 7 = 70
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