book Maths Puzzle Numerical Ability

how do you find all solutions

x^2+3x+6=4

there is a division sign over the whole equation

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book Other Question

if three times the smaller of two consecutive integers is added to four times the larger, the result is 130. find the smaller integer. I am having trouble with this question. I think I might know the answer but I am not sure, can you help me? Car thieves steal one automobile out of 400 of a certain type every yea