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7x+6x=7+6
13x=13 /:13
x=1
1/3x+2+x
1i1/3x + 2
-7(2x+1)=4
-14x-7=4
-14x=4+7
-14x= 11 /: (-14)
x= 11/14
8=6(x-1)-4x
8=6x-6-4x
8+6=6x-4x
14=2x /:2
x=7
2-2x=12x-12
-2x-12x=-12-2
-14x=-14 /:(-14)
x= 1