Question

Determina valoarea lui x din egalitate: x+10+x+10=x+x+x+x A)5, B)10, C)15, D20, E)0

Answer 1

2x+20=4x
20=4x-2x
x=20:2
x=10
raspuns B

Answer 2

2x+20=4x |-2x
20=2x |:2
10=x

Raspun corect: B)