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x=57-75
x=-18
2. 7x+7=35
7x=35-7
7x=28 |:7
x=4
3. 97=2x-5
2x=102 |:2
x=51
4. 17=11-12x
17-11=-12x
-12x=6 |:-12
x=-0,5
5. 7y=24 |:7
y=3³₇
6. 2-x=5-2x
-x+2x=5-2
x=3
7. x-34=-35
x=-35+34
x=-1
8. 2(x+7)=3(2x-5)
2x+14=6x-15
2x-6x=-15-14
-4x=-29 |:-1
4x=29 |:4
x=7,25