exam Maths Puzzle Numerical Ability

Please help me confirm I am doing this correctly:
4(2(-5x+y)-y)-10(y-4X) with the outside set of parenthesis being brackets

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exam Other Question

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Solve
3(x - 2) + 7x = 8x + 0
x^2+3x+2 x^2+5x+4
________ / _________

x^2+7x+12 x^2+5x+6