book Maths Puzzle Numerical Ability

simplify the rational expresion

6 - 2x
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4x - 12

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book Other Question

what is the answer to this? 4x=3x+1. and how do i write the workings out?
thank you a chemist has one solution that is 60% chlorinated and another that is 40% chlorinated. How much of each solution is needed to make a 100 L solution that is 50% chlorine?