Explicación paso a paso:
x+5=12
x=12-5
x=7
x+7=14
x=14-7
x+10=22
x=22-10
x=12
x-4=16
x=16+4
x=20
x-3=19
x=19+3
x=21
x-2=18
x=18+2
2x=8
x=8/2
x=4
3x=15
x=15/3
x=5
4x=16
x=16/4
x/2=10
x=10(2)
x/4=5
x=5(4)
x/3=6
x=6(3)
x=18
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Explicación paso a paso:
x+5=12
x=12-5
x=7
x+7=14
x=14-7
x=7
x+10=22
x=22-10
x=12
x-4=16
x=16+4
x=20
x-3=19
x=19+3
x=21
x-2=18
x=18+2
x=20
2x=8
x=8/2
x=4
3x=15
x=15/3
x=5
4x=16
x=16/4
x=4
x/2=10
x=10(2)
x=20
x/4=5
x=5(4)
x=20
x/3=6
x=6(3)
x=18