7 2x 15 4x July 8, 2019 16 32 64 128 4x 7 2x 15 como solver 1 2x 7 3 4x 15 Y =- 2x 7 y =- 4x 15 4 7 2x 9 15 9 4x 21 9 2x 15 or 7 4x - 9 15 4x 7 2x 1 2x 7 7-4x 15 7-2x 15 7x 15