exam Maths Puzzle Numerical Ability

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y-(9y-8)=5-2y-3(2y-3)+29

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exam Other Question

I have a question that states: use long division to divide (2x^2+6x^3-10-8x)/(2x+2). Can anyone walk me through this one so that I can do the remaining 5? determine the perpindicular distance between
a. the parellel planes: x+2y+3z+6=0 and x+2y+3z-6=0