Okay what you could do is type 400 divided by 2/3 into a calculator, but on paper you would do 400 divided by 3, which is 150, then multiply 150 by 2 since it’s “2/3’s” of 400. 400 / 3 = 150, 150 x 2 = 300, so 300 is correct.
Step-by-step explanation: First you do 7 x 10 which equals 70 then 7 x -3x equals -27x. Next you do 5 x 10 which is 50 next you do 5 x -4x equals -20x. So your answer is 70-27x = 50-20x