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Maths Puzzle
Numerical Ability
Increaing a number by five and then doubling the outcome is the same same as decresing the number by twelve
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x^2+x+1=0
Can u please solve it and show me how to check it? thank you very much.
2/7x2&1/8x3=
6&1/28, 9/4, 1&23/28, or none of these?