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OpenStudy (virnios):
-3x + 6y = -21 find the value of y when x equals -7
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OpenStudy (alexandervonhumboldt2):
substitute -7 for x
OpenStudy (alexandervonhumboldt2):
-3*(-7)+6y=-21
OpenStudy (alexandervonhumboldt2):
21+6y=-21 solve
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