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w+2=(a+2)·2
w-a=8
w+2=[a+2]×2
w+2=2a+4
w=a+8
a+8+2=2a+4
10-4=2a-a
a=6
w=6+8=14
w+2=(a+2)*2
w-2a=4-2
w-2a=2 /·(-1)
-w+2a=-2
______________
w-6=8
w=14
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w+2=[a+2]×2
w-a=8
w+2=2a+4
w=a+8
a+8+2=2a+4
w=a+8
10-4=2a-a
w=a+8
a=6
w=6+8=14
w+2=(a+2)*2
w-a=8
w+2=2a+4
w-a=8
w-2a=4-2
w-a=8
w-2a=2 /·(-1)
w-a=8
-w+2a=-2
w-a=8
______________
a=6
w-a=8
w-6=8
w=14