Question

40:2+800:5=x:3-40×2
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Answer 1

$40 \div 2 + 800 \div 5 = x \div 3 - 40 \times 2 \\ 20 + 160 = x \div 3 - 80 \\ 180 = x \div 3 - 80 \\ x \div 3 = 180 + 80 \\ x \div 3 = 260 \\ x = 260 \times 3 \\ x = 780$

Answer 2

40:2+800:5=x:3-40×2

20+160=x/3-80

180 = x/3-80

540=x-240

-x=-240-540

-x=-780

x=780