John tried to evaluate the expression 30+{15 - 2 x 3). His work is below. 30+ {15 - 2 x 3} Step 1: = 30 + {15 - 6} Step 2 : 30 + 9 Step 3: 39 In which step did John first make a mistake? Choose 1 Step 1 step 2 step 3 or d john did not make a mistake