6.2 Finding solutions to a system of linear equations

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11:46, for the second Eqn, is that supposed to be -8xsubscript 2? if so how come? I was thinking since we are adding -3xsubscript1 we would get -5x. I don't know what variable makes -2(_)-3=-8, so I was just curious if there was a specific way we need to do it.

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