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After entering Mary's house, they go straight to the backyard. They saw a 50 cm pipe tube being cut into two pieces. the longer one is 2 cm longer than twice the length of the shorter one.
They want to know the length of the two cut pieces. the shorter one represents as X, so that 2X +2+X=50 cm.
First, they combine 2X+X which results to 3X, so that will make 3x+2=50. then next tranferring 2 to the other side and make it negative and find their difference, so 50-2=48. then it will make 3X=48, the last is divide both sides by 3 to isolate the X, so 3X/3=48/3 which results to X=16 so the length of the shorter one is 16 cm while the longer one is 34 cm. Adding 16 cm and 34 cm which results to 50 cm.
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