Explicación paso a paso:
X+23=15
X=15-23
X=-8
2x=1280
2x=1280/2
x=640
X-270=120
X=120+270
X=390
X+(X+100)=150
2x+100=150
2x=150-100
2x=50
x=50/2
x=25
x+(x-20)=380
2x=380+20
2x=400
x=400/2
x=200
2x+45=65
2x=65-45
2x=20
x=20/2
x=10
3x-78=18
3x=18+78
3x=96
x=96/3
x=32
2x=x+7
2x-x=7
x=7
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Explicación paso a paso:
X+23=15
X=15-23
X=-8
2x=1280
2x=1280/2
x=640
X-270=120
X=120+270
X=390
X+(X+100)=150
2x+100=150
2x=150-100
2x=50
x=50/2
x=25
x+(x-20)=380
2x=380+20
2x=400
x=400/2
x=200
2x+45=65
2x=65-45
2x=20
x=20/2
x=10
3x-78=18
3x=18+78
3x=96
x=96/3
x=32
2x=x+7
2x-x=7
x=7