1+[2x-3(1.8/0.2)] <- first you do 1.8/0.2 which equals 9
1+[2x-3(9)] <- Now you multiply 3 by 9 which equals 27
1+[2x-27] <- You take off the [ ] since there is only addition and subtraction
1+2x-27 <- You do 1 - 27 which equals -26 and the final answer is......
2x - 26