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Mathematics, 13.06.2021 08:50 saharaapollonio

Help:( If you were to solve the following system by substitution, what would be the best variable to solve for and from what equation?
21+ =9
31-121= 15
A. x; in the first equation
B. Xin the first equation
c. x in the second equation
D. , in the second equation

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