12-2*(x+3)=26
12-2x-6=26
-2x=26-12+6
-2x=20 |* (-1)
2x=-20|: 2
x=-10
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12-2*(x+3)=26
12-2x-6=26
-2x=26-12+6
-2x=20 |* (-1)
2x=-20|: 2
x=-10