exam Maths Puzzle Numerical Ability

2logx-log7=log112

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exam Other Question

5/x+6 + 2/xto the second power+7x+6 = 3/x+1 Solve for x. I do not even know how to start this problem. Thank you in advance. 1.5x-2y=-0.25
3x+1.5y=6.375

Solve with addition method