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x=546/21
x=26
comprobación: 26*21=546
2° 2x+3=47
2x=47-3
x=44/2
x=22
comprobación: (22*2)+3=47
3° 6x+18=90
6x=90-18
x=72/6
x=12
comprobación: (12*6)+18=90
4° 9x+17=134
9x=134-17
x=117/9
x=13
comprobación: (13*9)+17=134
5° 19x-36=97
19x=97+36
x=133/19
x=7
comprobación: (19*7)-36=97
6° 8x-56=8
8x=56+8
x=64/8
x=8
comprobación: (8*8)-56=8
7° 24x-5=139
24x=139+5
x=144/24
x=6
comprobación: (24*6)-5=139