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2(1 - x) = 8
(1 - x) = 8/2
(1 - x ) = 4
x = 1 - 4
x = -3
b)
2x = 9 - 3x
2x + 3x = 9
5x = 9
x = 9/5
c)
(x/2) -5 = 4
x/2 = 4 + 5
x/2 = 9
x = 9 . 2
x = 18