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x * 3 + x * 2 = 150 : 2
3x + 2x = 150 : 2
5x = 75
x = 75/5
x = 15
2.
(x + 1) * 2 = 64
2x + 2 = 64
2x = 64 - 2
2x = 62
x = 62/2
x = 31
3.
x - 1 / 2 = 17
x - 1 = 34
x = 34 + 1
x = 35