12x-(2x+1)=9(2-x)
12x-2x-1=18-9x
10x-1=18-9x
10x+9x=18+1
19x=19/:19
x=1
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12x-(2x+1)=9(2-x)
12x-2x-1=18-9x
10x-1=18-9x
10x+9x=18+1
19x=19/:19
x=1
12x-(2x+1)=9(2-x)
12x-2x-1=18-9x
10x-1=18-9x
10x+9x=18+1
19x=19/:19
x=1