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a + b = 150
a = (4 + b)
Sustituyes a en la primera ecuación por el valor que toma en la segunda:
(4 + b) + b = 150
2b = 146
b = 146/2 = 73 y a = 77
a=4+b
4+b+b=150
4+2b=150
2b=150-4
2b=146
b=146:2=73
a=4+73=77