1. 9x + 13= 7x + 5
9х-7х=5-13
2
х=-8
х=-4
2. 3(2x + 5) +6=3
6х+15+6=3
6х=3-21
6х=-18
х=-3
3. 5x + 18 = 7x + 6(3x - 7)
5х-7х=18х-42-18
-2х-18х=-60
-20х=-60
х=3
4. 3x - 7(3x - 4) = 5(2x - 7)
3х-21х+28=10х-35
-18х-10х=-35-28
-28х=-63
х=2,25
5. 13-3(5x + 1)-6(4x - 3) = 5x
-15х-3-24х+18-5х=-13
-44х=-13-15
-44х=-28
х=7/11
6. 4(x + 2)-0,7 = 2(2x + 4) +0,3
4х+8=4х+8+0,3+0,7
4х-4х=8-8+1
0х=1
корней нет
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Answers & Comments
1. 9x + 13= 7x + 5
9х-7х=5-13
2
х=-8
х=-4
2. 3(2x + 5) +6=3
6х+15+6=3
6х=3-21
6х=-18
х=-3
3. 5x + 18 = 7x + 6(3x - 7)
5х-7х=18х-42-18
-2х-18х=-60
-20х=-60
х=3
4. 3x - 7(3x - 4) = 5(2x - 7)
3х-21х+28=10х-35
-18х-10х=-35-28
-28х=-63
х=2,25
5. 13-3(5x + 1)-6(4x - 3) = 5x
-15х-3-24х+18-5х=-13
-44х=-13-15
-44х=-28
х=7/11
6. 4(x + 2)-0,7 = 2(2x + 4) +0,3
4х+8=4х+8+0,3+0,7
4х-4х=8-8+1
0х=1
корней нет