book Maths Puzzle Numerical Ability

how do i solve this problem? x-7=y and 2y+25=3x

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book Other Question

Hi, I'm in physics and am having trouble with some problems...Here's one:

"A science student is riding on a flatcar of a train traveling along a straight horizontal track at a c If the price of a $15 T-shirt is reduced by 1/3, how much sales tax must be paid on the T-shirt in a state having a 4% sales tax?