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Mathematics, 01.04.2021 16:30 makaylamsikahema

How do I solve a system of equations with 3 equations and 3 variables? I have figure out to get the answer in slope intercept form, but i don't know what to do from there. here is an example
-a + 3b - 6c = 20
a + 4b - c = 15
-7b - 5c = -23

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