Tim x : 280 - ( x - 140 ) : 35 = 270; ( x - 5 ) . ( x^2 - 4 ) = 0

Tim x :
a, 280 - ( x - 140 ) : 35 = 270
b, ( x - 5 ) . ( x^2 - 4 ) = 0
c, 2^2.x-1 :4 = 8^3
d, ( x + 2 )^5 = 2^10
e, (-x + 31 ) - 39 = -69
f, -121 - (35 - x ) = 50
g, 17 + x - ( 352 - 400 ) = -32
h, 2130 - ( x + 130 ) = 72 = -64
MINH CAN GAP !!!!!!!!!!!!