x = 3
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3x+42=6x+12 42=6x-3x+12 42=3x+12 42-12=3x 30=3x 10=x
6x+4=3x+12 => 6x-3x=12-4 => 3x=8 => x=8/3=2.666...
3x+50=6x+14 50-14=6x-3x 36=3x x=36 / 3 therefore x=12
3x + 5 = 6x + 23 -3x = 18 x = -6
6x + 47 = 9x + 11 6x + 36 = 9x 36 = 3x 12 = x