Question 211729
3(x+3)+4*x=96
3x+9+4x=96
7x=96-9
7x=87
x=87/7
x=12.42857 cm. is the side of the square.
Proof:
3(12.42857+3)+4*12.42857=96
3*15.42857+49.71428=96
46.28571+49.71428=96
96~96