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How do you do this solved by substitution?

How do you do this solved by substitution?
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How do you do this solved by substitution?

How do you do this solved by substitution?-example-1
User AutoKarma
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x=-12-3y
2(-12-3y) - y = -3
-24 - 6y - y = -3
-7y = 21
y = -3

x = -12 - 3(-3)
x = -3
User Mnel
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