book Maths Puzzle Numerical Ability

i need help solving 6x+5-7x=10-4x+3 and 5-2(x+5)=3(x-2)-1

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I dont understand how you solve equations by using multiplication and division...Can you help me understand it? John drove to a distant city in 5hrs. When he returned, there was less traffic, and the trip took only 3hrs. If John averaged 24mph faster on the return trip, how fast did he drive