exam Maths Puzzle Numerical Ability

how would I solve

sqrt -x +7 = x-1=6x

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exam Other Question

The length of a rectangle is 2 in. more than twice its width. If the perimeter of the rectangle is 52 in., find the width of the rectangle. Answer the following three problems using Addition, Graphing, or Substitution Method. Each method will be used once, and indicate which method you used.

x+3y+4
x=3


1/5x+1