exam Maths Puzzle Numerical Ability

inequaliyt 7<4x+3<21, what is the interval

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how do i do this?
Simplify the following fraction by putting it in lowest terms or by performing the indicated operation.

3xsq. ysq. -6xz over 6xsq. yz 15. 17+2n=21+2n 19. 18-3.8x=7.36-1.9x