Aver
Explicación paso a paso:
2) 6x+12+3x-12=18
9x=18
X=2
3)5x-25-2x=20
3x=45
X=15
4)21-5x=3x+7
168-40x=9x+21
147=49x
X=3
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Aver
Explicación paso a paso:
2) 6x+12+3x-12=18
9x=18
X=2
3)5x-25-2x=20
3x=45
X=15
4)21-5x=3x+7
168-40x=9x+21
147=49x
X=3