4m+9+5m-12=42
9m=45
m=5
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4m + 9 + 5m - 12 = 42 9m -3 = 42 9m = 42 + 3 9m = 45 m = 5
4m + 9 + 5m - 5 = 42 9m + 4 = 42 9m = 38 m = 38/9
4m + 12 = 604m + 12 -12 = 60 -12 (1st subtract 12 from both sides)4m = 484m/4 = 48/4 (now divide both sides by 4 to solve for m)m = 12
M = 5 * * * * * 4m + m - 11 = 9 or 5m - 11 = 9 so that 5m = 20 and then m = 4, NOT 5.
0.5 + 4m = 3m - 2.5 (subtract 0.5 and 3m to both sides)0.5 - 0.5 + 4m - 3m = 3m - 3m -0.5 -2.5m = -3Check:0.5 + 4m = 3m - 2.5 (substitute -3 for m)0.5 + 4(-3) =? 3(-3) - 2.50.5 - 12 =? -9 -2.5-11.5 = -11.5 TrueThus, for m = -3 the above equation is a true statement.