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20 - 2 + x = 8
18 + x = 8
x = 8 - 18
x = - 10
X= -20+2+8
X= -10
comprobación
20-2+(-10)=8
18+(-10)=8
18-10=8
8=8
entonces X si es igual a -10
espero te sirva n.n