18x+6+2−2x=15x+2
18x+6−2x=15x
16x+6=15x
6=15x−16x
6=−x
−6=x
x=−6
Comprobación
18×−6+6+2−2×−6=15×−6+2
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18x+6+2−2x=15x+2
18x+6−2x=15x
16x+6=15x
6=15x−16x
6=−x
−6=x
x=−6
Comprobación
18x+6+2−2x=15x+2
18×−6+6+2−2×−6=15×−6+2