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y=2x+12

7x+y=24 (as there is y in both equations you can assume that the equations are equal to each other, so substitute)

7x+2x+12=30 (solve)

9x=18

x=2 (substitute into the first equation to solve for y)

y=(2x2)+12

y=16

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Q: How do you solve basic linear equation?
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