- I have no idea how to do this?

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Find all of the actual roots of the polynomial: x^3 - 2x^2 + 5x + 26 = 0? Find all solutions to the following system of nonlinear equations.
(x − 2)^2 + y ^2 = 20
(x + 2)^2 + y^ 2 = 20? Describe how and where new crust material is made. Describe how and where old crust is destroyed.? 7^(x+1) + 7^x + 7^(x-1) = 399, what is x? Could someone help me with these math problems? I can't figure them out. Solve the linear equation;
x+2y=15
y=-2x+0 9x-12y=-3
-12x+16y=4?