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Y=-5x and 21x-7y=28 using substation method
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Y=-5x and 21x-7y=28 using substation method

User Kibartas
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21x - 7(-5x) = 28

21x + 35x = 28

56x=28
56 = 56
x = .5 or 1/2
User Cemsazara
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