7с=21d+7 12m+24n=18 45m+15n-30

Question

7с=21d+7

12m+24n=18

45m+15n-30

Answer 1

7с-21d+7=7(c-3d+1)

12m+24n-18=6(2m+4n-3)

45m+15n-30=15(3m+n-2)

Answer 2

7c + 21d + 7 = 7(c +3d + 1)

12m + 24n +18 = 6(2m + 4n + 3)

45m + 15n - 30 = 15(3m + n - 2)