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12+6x-23=x+18
6x-11=x+18
Despejas x
6x= x+18+11
6x-x=29
5x=29
x=29/5
Si sustituyes x en tu ecuación original
6(2+29/5)-23=29/5+18
23.8 = 23.8
3) 4(2x+2)+5=5x+12 y repites lo anterior
8x+8+5=5x+12
8x+13=5x+12
8x-5x=12-13
3x= -1
x= -1/3
Sustituyes
4(2x-1/3+2)+5 = 5(-1/3)+12
31/3 = 31/3
10.3333 = 10.3333