The sum of 3 times a number and 7

Evaluate the given expression if m=45 |-3m|

Which triangle congruence postulate or theorem justifies my claim that the steps i made using construction paper and scissors produce an isosceles triangle? was it sss, sas, asa, aas, or hl?

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?