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Mathematics 17 Online
OpenStudy (anonymous):

2x + y = 5 x − 2y = 10 y = 5 − 2x x − 2(5 − 2x) = 10 x + 10 + 4x = 10 5x + 10 = 10 5x = 0 x = 0 2(0) + y = 5 y = 5

OpenStudy (atlas):

It should be x-10+4x = 10 in line number 5

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