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kifflom [539]
3 years ago
12

Three times the sum of a number and seven is two less than five times the number.

Mathematics
1 answer:
m_a_m_a [10]3 years ago
4 0
3 (x + 7) =  5x - 2
3x + 21 = 5x - 2
3x - 5x = -2 - 21

-2x = -23 
x = -23/-2
x = 23/2


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Answers:

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  1. Note how (11)^2 = (11)*(11) = 121 and also (-11)^2 = (-11)*(-11) = 121. The two negatives multiply to a positive. So that's why the solution is x = plus/minus 11. The plus minus breaks down into the two equations x = 11 or x = -11.
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