book Maths Puzzle Numerical Ability

3c+2(c+2)=13-(2c-5)

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book Other Question

Complete the ordered pair to make a solution to the given equation (-7/2, ?); the equation is
-2x+3y=25
Need to solve this by using square root property:
4x^2 -48 = 0

Please help and show me how you get the answer