exam Maths Puzzle Numerical Ability

Find the domain of the rational function:
f(x) = (2x^2 - 4) / (3x^2 + 6x - 45)

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exam Other Question

solve by the substitution method
2x-y+2/2=22
3x+y+2/3=7

If anyone can answer the math problem I would deeply appreciate it very much. Please and Thank You translate the following statement into an algebraic equation .let x respresent the number .9 more times than 3 times a number is 10 times that same number.