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There are four examples on Khan Academy at the link below:

https://www.khanacademy.org/math/algebra/systems-of-eq-and-ineq/systems-of-eq-overview/v/solving-systems-by-substitution-1

https://www.khanacademy.org/math/algebra/systems-of-eq-and-ineq/systems-of-eq-overview/v/solving-systems-by-substitution-1

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x+6=-2x-3

3x=-9

x=-3

easy.

but not sure what the substitution is, cause I don`t learn math in English

3x=-9

x=-3

easy.

but not sure what the substitution is, cause I don`t learn math in English

0

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