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7x = 21
x = 3
2. -5x-4x = 1-10
-9x = -9
x = 1
6x + 5 = 26 - x
6x + x = 26 - 5
7x = 21
x = 3
2)
-5x -4x + 10 = 1
-5x - 4x = 1 - 10
-9x = - 9
x =1