a)2x+1=-5
2x= -5-1
2x=-(5+1)
2×=-6
2×÷2=-6÷2
x=-3
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Răspuns:
Ex.2
2(x+1)-3(2-x)=x+3(2x+1)
2x+2-6-3x=x+6x+3
2x-3x-x-6x=3-2+6
-8x=7
x=-7/8