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Anonymous
If you mean: 3+2x = 12 and 4y-x = 5 then their values are x = 4.5 and y = 2.375
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3x=2x-12x=-12
3x+7=2x-5 x=-12
x = 15
2x to the fourth power minus 162 equals -146
x = 4 and y = 7