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1/2x + x + x = 10 /*2
x + 2x + 2x = 20
5x = 20 /:5
x = 4
b)
x + 1/3x = 30 - 12 - 6
x + 1/3x = 12 /*3
3x + x = 36
4x = 36 /:4
x = 9