Ответ:
1) 7-2x=9-3x
-2x+3x=9-7
x=2
2) 4(3x+5)-5(4x-3)=3
12x+20-20x+15=3
12x-20x=3-20-15
-8x=-32
x=-32:(-8)
x=4
3) 5x-3(4x-1)=7-2(7x+2)
5x-12x+3=7-14x-4
5x-12x+14x=7-4-3
7x=0
x=0:7
x=0
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Answers & Comments
Ответ:
1) 7-2x=9-3x
-2x+3x=9-7
x=2
2) 4(3x+5)-5(4x-3)=3
12x+20-20x+15=3
12x-20x=3-20-15
-8x=-32
x=-32:(-8)
x=4
3) 5x-3(4x-1)=7-2(7x+2)
5x-12x+3=7-14x-4
5x-12x+14x=7-4-3
7x=0
x=0:7
x=0