Verified answer

18m + -7 + 12m = 23 ~

30m + -7 = 23

30 m = 30

m = 1

5(3t) + -7(2t) = -1 ~

15t + -14t = -1

1t = -1

t = -1

18m + -7 + 12m = 23

true only if m equals a certain value

18m + 12m = 7 + 23

30m = 30

m = 1

5(3t) + -7(2t) = -1

15t - 14t = -1

t = -1

.

18m -7 +12m = 23

18m +12m = 23 +7

30m = 30

m= 1

__________

5(3t) - 7(2t) = -1

15t - 14t =-1

1t = -1

t= -1

Hope this helps!

Good LUCK