book Maths Puzzle Numerical Ability

7x-8=3x+12

can you help me find x

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decide what values of the variable cannot possible be solutions for each equation. do not solve. (5)/(2x+3) + (1)/(x-6) = 0 . if just need to know how to do it. i dont want the an What is 3g^2+g+1 factored.