exam Maths Puzzle Numerical Ability

Could you please help me solve this system of equations by using A^-1?

x+5y+5z=-7
x+4y+5z=-5
x+5y+4z=-5

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exam Other Question

Given any triangle, why is the measure always egual to 180 degrees? i have to simplify this equation 1/8(3x + 1)^(3/2) + 1/4(3x + 1)^(1/2)

thanks