Explicación paso a paso:
7x-12=30
7x-12+12=30+12
7x=42
7x 42
__=_____
7 7
x=6
5x-18=77
5x-18+18=77+18
5x=95
5x 95
__=__
5 5
x=19
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Explicación paso a paso:
7x-12=30
7x-12+12=30+12
7x=42
7x 42
__=_____
7 7
x=6
5x-18=77
5x-18+18=77+18
5x=95
5x 95
__=__
5 5
x=19