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-2x+8-8 = -21-8
-2x = -29
x = -29/-2
x = 29/2
x = 14,5
-4x-6 = -2
-4x-6+6 = -2+6
-4x = 4
x = 4/-4
x = -1
2x+4 = 6
2x+4-4 = 6-4
2x = 2
x = 2/2
x = 1
x=-29/-2
x=14.5
-4x=-2+6
x=4/-4
x=-1
2x=6-4
x=2/2
x=1