Usuń nawiasy i wykonaj redukcję wyrazów podobnych (7x+2y)+(3x-8y)-(2x-4)= (4x+3y) - (11x-3y) - (5x-10)= (12a+5) - (3a+4b) + (3b+15)= (1,5a-0,4b-2) - (3,5a-7,8b+5) - (3a-2)= (-7,5x+4,75y) - (3,75x-8,25y)= (125z2 -3z+8) - (35z2-15z+8) + (3-2z)= z2=z

(7x+2y)+(3x-8y)-(2x-4)=7x+2y+3x-8y-2x+4=8x-6y+4 (4x+3y) - (11x-3y) - (5x-10)=4x+3y-11x+3y-5x+10=-12x+6y+10 (12a+5) - (3a+4b) + (3b+15)=12a+5-3a-4b+3b+15=9a-b+20 (1,5a-0,4b-2) - (3,5a-7,8b+5) - (3a-2)=1,5a-0,4b-2-3,5a+7,8b-5-3a+4=-5a-7,4b-2 (-7,5x+4,75y) - (3,75x-8,25y)=-7,5x+4,75y-3,75x+8,25y=-11,25x+13y (125z² -3z+8) - (35z²-15z+8) + (3-2z)=125z²-3z+8-35z²+15z-8=90z²+13z

1. 7x+2y+ 3x - 8y - 2x +4 = 8x - 6y +4 2. 4x + 3y - 11x + 3y -5x + 10 = -12x + 6y +10 3. 12a + 5 - 3a - 4b + 3b +15= 9a  + 20 - 1b 4. 1,5a - 0,4b - 2 - 3,5a - 7,8b + 5 - 3a +2= -5a - 8,2b + 5 5. -7,5x + 4,75y - 3,75x - 8,25y =  -11,25x - 3,5 y 6. 125z² - 3z + 8 - 35z² +15z - 8 + 3 - 2z = - 90z² +10z +3