exam Maths Puzzle Numerical Ability

i need 2 slove each equation or formula for the specified variable.

2xy=x+7 for x

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exam Other Question

Please help me solve: 5^2x+1 = 125^x and solve: 6^x+1 - 28 = -log 8 Solve by a method of choice

a 3x+4y=-8
b 2x+3y=-3
c 4x+y=5
d 12x+3y=15

Please help me on this equation

Thanks