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- 15x + 13x = - 2x
( 8 a + 6) + ( - 7a ) - 7 = 8a + 6 - 7a - 7 = a - 1
( 29a - 14) + ( - 28a + 13) = 29a - 14 - 28 a + 13 = a - 1
(4t² - 7t - 3) + ( - 2t² + 4t + 4) = 4t² - 7t - 3 - 2t² +4 t + 4= 2t² - 3t + 1
( - 20 t² + 17 t + 5) + ( 22t² - 20t - 4) = - 20 t² + 17t + 5 + 22 t² - 20 t - 4 =
2 t² - 3 t+ 1