book Maths Puzzle Numerical Ability

how would you solve a problem such as -7a=-12a-65? i dont understand this

josh

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book Other Question

if you have a triangle the smallest side = 3cm and the longest side =10cm was does x = Kyle left Miami and drove at a speed of 46 mph. Eric left 1 hour and 45 minutes later and drove at a speed of 62 mph. How long will it take Eric to catch up with Kyle?