Calculați reducând termenii asemenea:
a)2x+3y+5z-4x+2y-3z
b)(3a-5b)+(-7a+2b)
c)x la a 2+2x+5-(3x la a 2+5x-3)
d) (4x-3y)+(5x-3y)-(5x+6y)
e)4x+3y-5x+2y
f)7x+12-3 (7x+12)