Simplify 3x + 5x, 8x, 15x, Simplify 7a - 4a + a , 6a, 8a, 4a, 11a, Evaluate 2x2 - 3x + 5 when x is 4, 30, 25, 6, 15, Solve for x : x + 9 = 15, x = 7, x = 9, x = 4, x = 6, Expand 5(2x + 3), 15x + 10, 10x + 15, Expand 3( y - 4 ), 12y - 3, 3y - 12.

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