book Maths Puzzle Numerical Ability

prob. 74_

solve and graph the solution for the inqualities.

7(x-3) >5x -14
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book Other Question

2x+5=13,...

3x-15=9,.. Explain the process and show EACH step in the process of simplifying the following problems:
a.(sqrt2 + 5)(sqrt2 - 3)
b. sqrt5/sqrt8
c. (6 - sqrt20)/2