Which number can each term of the equation be multiplied by to eliminate the decimals before solving? –m + 0.02 + 2.1m = –1.45 – 4.81m

The number with which each term is multiplied is 100.
if we multiply each number with 100, it will eliminate decimals.
100 x (-m + 0.02 + 2.1m) = 100 x (-1.45 - 4.81m)
-100m + 2 + 210 = -145 -481m
Now you see that there is no decimal number in the expression.