The correct solution is:
7*(5x+2)=154
7*5x + 7*2 = 154
35x + 14 = 154
35x = 154 - 14
35x = 140
x = 140/35
x = 4
Answer:
140/35 is equivalent to 4, Susan just did not multiply. So joe is incorrect, and option D is the answer.
