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1]
-2x+4x+4=12
2x=12-4
x=8/2
x=4
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2]
4x-3x=0
x=0
3]
2x+6-x=4x
6=4x-x
3x=6
x=6/3
x=2
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4]
2x+9=2x+6+3
2x+9=2x+9
5]
[5x-3]/14=1/2
14=10x-6
14+6=10x
x=20/10
x=2
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