Question

substitution the equations
x+x=9
2x-x=27​

Answer 1

Answer:

$x + x = 9 \\ 2x = 9...i$

$2x - x = 27 \\ from \: eq \: i \: we \: get \:$

Step-by-step explanation:

$(9) - x = 27 \\ - x = 27 - 9 \\ - x = 18 \\ x = - 18$

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