exam Maths Puzzle Numerical Ability

solve for x .
log(x+7)-logx=3

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exam Other Question

the area of a rectangle has an area of 52cm^2 and its length is 1 cm more than 3 times its width find the perimiter of the rectangle solve the system by additio or substitution
3x+6y=0
x= 2/3

I have no idea how to work this problem with a fraction. Please help.