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2x = 2+1
2x = 3 /2
x = 1 i 1/2
3 - 2x = 7
-2x = 7-3
-2x = 4 /(-2)
x = -2
8 = 7 - 1/2x
1/2x = 7-8
1/2x = -1/(1/2)
x = -2
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