book Maths Puzzle Numerical Ability

5-2(x-3)=2+4(x-1)-3x

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I dont understand why the 7 in the problem stays 7 in the answer.Why dont you multiply it by 7 making it 49? Hi I am having diffuclties setting up this problem:

If 46 painters used 70 nails in 90 days how many nails would 23 painters use in 60 days?