book Maths Puzzle Numerical Ability

Please show me how to solve the following equation:

6x + 7 = 8x - 13

Thank you!

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book Other Question

I would appreciate your help in simplifying the following:

sqrt(5)+3i/1-i

The answer need to be in the form a + b, where a and b are real numbers.

I'm coming up with a den Could you help me solve this problem.. 10x-2y=4