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4x + 12 - 1 + x = 1
5x + 11 = 1
5x = 1 - 11
5x = - 10
x = -10/5
x = - 2
Solución :
x = - 2
4(x+3)-(1-x)=1
4x+12-1+x=1
5x+11=1
5x=1-11
x=-10/5
x=-2