exam Maths Puzzle Numerical Ability

I have to remove the () and simplify when possible can you help me to understand?
8d-(-7c-2d)

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exam Other Question

Solve the equation
11 divided by x = 4 minus 1 divided by x
thanks,
pat I need help simplifing radicals, the problem says to express in simpliest radical form: radical 3x/2y