exam Maths Puzzle Numerical Ability

solve by the substitution method

3d+e/4= d+1/2
d-e/4 = 1



If anyone can answer this math problem I would deeply appreciate it. Please and Thank You

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exam Other Question

I need to completely factor out this problem. can anyone help me?

3x^4 + 6x^3 + 5x^3 + 10x^2
solve for y:

ln(y-1)=x+ln(x)