book Maths Puzzle Numerical Ability

I need help solving this problem: -10-7x+6x=-22

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book Other Question

You are flying in an open plane at an altitude of 2304 feet and you drop a Coca Cola bottle out of the window. The bottle will hit the ground after _?_ seconds. a boy has 7 more dimes than quarters. The total value of the coins is $4.90. Find the number of dimes and quarters.