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If: m = 20 Then: 3m+18 = 78
2m + 2 = 3m + 4 => 2m-3m = 4-2 => -m = 2 => m= -2
-3m + 8 = 2 -3m = 2 - 8 -3m = -6 m = -6/-3 m = 2
m = -12
If: 7+3m = -29 then the value of m is -12