Tìm x, biết: a) 5x - (15 + 2x) = 2x + (18 - 4 . (-3)); b) 72 - (4 - 6x) = 4x - (-15 - x); c) -25 + (3x - 4) = 2x + 21
Tìm x, biết
a. 5x - ( 15 + 2x ) = 2x + ( 18 -4 . ( -3)
b. 72 - ( 4- 6x ) = 4x - ( -15 -x )
c. -25 + ( 3x - 4 ) = 2x + 21
d. 2. ( x + 3 ) = x + 15
e. 15 + 3x . ( 4 + x ) = 18 + 2x
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