exam Maths Puzzle Numerical Ability

Help me solve this equation: 0.31x+0.49(x+315)=215.15

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I need a step by step walkthrough of any proof, and I need it quickly. Someone please help me. I need to subtract two rational expressions, and the problem is
((3a+2b)/(3b)) - ((a+2b)/(6a))
I do not understand how to find the lowest common denominator, and what to do after I do find it.