you r asking a number whose twice will be 4 but less than 8.
so,
take a no. x.
by ques. 2x=4;
2x=4;
x=4/2;
hence x=2;
2 is answer and less than 8 of twice it.
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3*(n - 5) = 2*n + 11
it means multiplying the original number by two and then subtracting two, like if your original number was 10, 10 times two equals 20 minus 4 equals 16.
2n - 2
2x-3
2k - 7