book Maths Puzzle Numerical Ability

I need help on a few basic concepts before I start Pre-calculus. can you show me how I would figure out the square root of 15-2x=x

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What is the domain, range, and zeroes of f(x)=x^2-6x=4 please help me solve: 3y^2-x-12y+14=0
write the equation in standard form