book Maths Puzzle Numerical Ability

I would please like your help with this problem: 5x-3(2x-1)=5-3(-x+2)

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book Other Question

2x + 3y = 31
y = x + 7 Please help me so I can help my daughter.......The problem is......There are four 3-cent and three 5-cent stamsp. Using one or more of these stamps, how many different amounts of