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4x − 12 = 3 + 2x
4x − 2x = 3 + 12
2x = 15
. x = 15 :( ) ()
2
x
16 − x .
105 .
5x + 10(16 − x) = 105
160 − 5x = 105
−5x = −55
. x = 11
:( ) ( )
5 − 4x 2 = 3(2x + 1) + 2
5 − 4x 2 = 6x + 3 + 2
−4x 2 − 6x = 0
−2x(2x + 3) = 0
2x + 3 = 0 −2x = 0
.x2 = −3 x1 = 0
2
:( ) ()
x+2 =3
x