exam Maths Puzzle Numerical Ability

10-x+3x=2x-7+5x
solving for the unknown
not sure of the steps to solve this one because the varible is on both sides
I was given this question and asked to write it down from the board

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exam Other Question

Mr. chase had 5 times as much money in the bank as he had in the office safe. After he had taken $225 from his safe and deposited it in the bank, he had 8 times as much in the bank as in his safe. How much money had he in each place first? 4y squared -12y+9