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3x = 8 + 4
3x = 12
x = 12/3
x = 4
2x + 5 = 7
2x = 7 - 5
2x = 2
x = 2/2
x = 1
9 - T = 10
9 = 10 + T
T = 9 - 10
T = -1
3x - 10 = 30
3x = 30 + 10
3x = 40
x = 40/3
-3x + b = 20
-3x = 20 - b
3x = b - 20
x = (1/3)b - (20/3)
x + 5 = 12
x = 12 - 5
x = 7
8 + z = 10
z = 10 - 8
z = 2
6 - 7 = 4
6 = 4 + 7
6 = 11 proposición falsa