book Maths Puzzle Numerical Ability

x SQUARED(2) + 7 = 21 CAN YOU HELP ME SOLVE THIS EQUATION? ALSO COULD YOU EXPLAIN HOW YOU WOULD KNOW IF YOU SUBTRACT, DIVIDE OR ADD TO THE OTHER SIDE?

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book Other Question
y=4-3/4(x) graph and identify any intercepts how do i write the inequality y=5-x to represent the x-values when y<2????