1)3(2x+8)-(5x+2)=0
6x+24-5x-2=0
x+22=0 , x=-22
2)-3(3y+4)+4(2y-1)=0
-9y-12+8y-4=0
-y-16=0, y=-16
3)5(7-3x)+7(2+2x)=0
35-15x+14+14x=0
-x+49=0, x=49
4)8(3-2x)+5(3x+5)=9
24-16x+15x+25=9
-x+49=9, x=49-9, x=40
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Answers & Comments
1)3(2x+8)-(5x+2)=0
6x+24-5x-2=0
x+22=0 , x=-22
2)-3(3y+4)+4(2y-1)=0
-9y-12+8y-4=0
-y-16=0, y=-16
3)5(7-3x)+7(2+2x)=0
35-15x+14+14x=0
-x+49=0, x=49
4)8(3-2x)+5(3x+5)=9
24-16x+15x+25=9
-x+49=9, x=49-9, x=40
х + 22 = 0
х = - 22
б) - 9у - 12 + 8у - 4 = 0 (открыли скобки)
- у - 16 = 0
- (у + 16) = 0
у + 16 = 0
у = - 16
в) 35 - 15х + 14 + 14х = 0
- х + 49 = 0
х - 49 = 0
х = 49
г) 24 - 16х + 15х + 25 = 9
- х + 49 = 9
- х = - 40
х = 40