How do you simplify #18m-7+12m#?
Jan 8, 2016
by collecting like terms.
like terms are terms which have the same variable in them then you collect them by adding / subtracting their coefficients.
18m and 12m are like terms , - 7 is on it's own
18m + 12m = 30m
hence 18m - 7 + 12m = 30m -7