5-2×=8×+9; 7-6×=-4×-6; 5(×-9)=-2; 9(×+7)=-×

Question

5-2×=8×+9; 7-6×=-4×-6; 5(×-9)=-2; 9(×+7)=-×

Answer 1

5-2х=8х+9
5-9=8х-2х
-4=6х
х=-4/6
х=-2/3

7-6х=-4х-6
7-6=-4х+6х
1=2х
х=1/2

5(х-9)=-2
5х-45=-2
5х=-2+45
х=43/5
х=8 3/5

9(х+7)=-х
9х+63=-х
9х+х=-63
10х=-63
х=-63/10
х=-6 3/10

Comments

большое спасибо

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(^.^)

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