book Maths Puzzle Numerical Ability

-3(10x-3)+10(3x-3)=x-7

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book Other Question

Please help me solve the following word problem. I am confused about what formula to use.

It costs $57.20 to frame a rectangular painting with a flat aluminum strip. This was c solve - 2/3(x-5)=1+3/4(2-3x)