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-4b = -2
b = -2/-4
b = 1/2
2. m-2m = -4-2
-m = -6
m = 6
-4b = 6 - 8
-b = -2
b = 2
2. m + 2 = 2m -4
m - 2m = -4 - 2
-m = -6
m = 6