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6+10+2=5x-2x
18=7x
18/7=x
2,57=x
2x + 6 = 5x - 12
-3x = -18
x = 6
2. 12x - (7x - 4) = 6x + 18 - 18x
12x - 7x + 4 = -2x + 18
5x + 4 = -2x + 18
7x = 14
x = 2