6X - 20 = 12X - 426X - 12X -20 +20 = 12X -12X -42 +20
-6X = -22
X = 22/6
x = 11/3
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6X - 20 = 12X - 42
6X - 12X -20 +20 = 12X -12X -42 +20
-6X = -22
X = 22/6
x = 11/3