book Maths Puzzle Numerical Ability

please help me solve this equation: 3x +2(5x - 7)

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There is a triangle that has a line intersecting the interior of the triangle that is parallel to the base. The triangle is labeled starting at the top down the right side and goi Different interest rates. Mrs. Brighton invested $30,000 and received a total of #2,300 in interest. If she invested part of the money at 10% and the remainder at 5%, then how much did she invest at each rate?