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3x+8 = 12 3x = 4 x = 4/3
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6x+4=3x+12 => 6x-3x=12-4 => 3x=8 => x=8/3=2.666...
12 + 3x = 412 - 12 + 3x = 4 - 123x = -83x/3 = -8/3x = -8/3x = -(2 2/3)
70000000y=35t
3x = -12 so x = -4
x=12