That 4 in that last step in the solution above should be divided, not multiplied. Here's the solution in more detail: 4a+2 = 3b-5 Get rid of the +2 on the left by adding -2 to both sides: 4a+2 = 3b-5 -2 -2 ----------- 4a+0 = 3b-7 Ignore the 0: 4a = 3b-7 Get rid of the multiplied 4 by dividing both sides by 4: 4a 3b-7 覧覧 = 覧覧 4 4 Cancel the 4's on the left4a 3b-7 覧覧 = 覧覧44 3b-7 a = 覧覧 4