I need help with this stupid question, my teacher got me confused when he kept talking about different things!

Solve the following: 12(x^2–x–1)+13(x^2–x–1)=25(x^2–x–1) 364x–64x=300x

Lines f and g are cut by the transversal d. the measure of 1 = 2x + 35 and the measure of 8 = 10x - 85. what value of x will show that lines f and g are parallel? a. 19 b. 26 c. 18 d. 15

Quadrilateral abcd is a parallelogram with diagonals that intersect at point e. which of the following statements is true?