exam Maths Puzzle Numerical Ability

the similtanious equation graph for y=x+4 and y=2x+2

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When John F. Kennedy was Sworn in as President, he was 1 year older than Teddy Roosevelt was when Roosevelt took the office. If the sum of their when each became President was 85, how wold was Kennedy when he was sworn in? How do I solve a rational equation? The problem is 3/x-1 = 6/x+2. Any help would be appreciated.