book Maths Puzzle Numerical Ability

3-3x=-6

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-5(d+3)=7d+5 and 2/5(a+10)=1/4(a+20), these should help me with the rest of the problems. I am doing the problems so that I can check his work. Thanks. I have had so many quizzes on this lesson, and I still don't uderstand them.please help.