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x+x+2=138
2x=138-2
2x=136
x=136 / 2
x= 68
los numeros son 68 y 70 son numeros pares y consecutivos , su suma da 138
b)x+x.2=279
3x=279
x=279:3
x=93 los numeros son 93 y 186
c)x+x-7=154
2x=154+7
2x=161
x=161:2
x=80,5 la base mide 80,5 y la altura 73,5