Tìm số nguyên x , biết :
a) x - ( - 38 - 2x ) = ( - 3 ) - 8 + 2x
b) 65 - ( - x + 15 ) - 5x = - ( - 12 + 5x )
c) 3x - ( - 12 + 7x - 21 ) = - 3 - ( 5x + 2 )
d) - 123 - ( - 2x - 23 ) = - ( 120 - x )
e) - 45 - ( - 25 - 5x ) = - ( - 16 + x )
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a: =>x+38+2x=-3-8+2x
=>3x+38=2x-11
=>x=-49
b: \(\Leftrightarrow65+x-15-5x=12-5x\)
=>-4x+50=-5x+12
=>x=-38
c: \(\Leftrightarrow3x+12-7x+21=-3-5x-2=-5x-5\)
=>-4x+33=-5x-5
=>x=-38
d: \(\Leftrightarrow-123+2x+23=x-120\)
=>2x-100=x-120
=>x=-20
e: =>-45+25+5x=16-x
=>5x-20=-x+16
=>6x=36
=>x=6