Below are two parallel lines with a third line intersecting them.
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Create and solve a linear equation that represents the model, where squares and triangles are shown evenly balanced on a balance beam. assume the weight of a square is 1 unit and the weight of a triangle is unknown.

Solve the equation by completing the square. x^2+2x=17

Find two numbers if their sum is 91 and the ratio is 6: 7?