Решите уровнение: 1)-12,7+(х-5,3)=0,9 2)0,3-(7,2+х)=-1,5 3)4 1/2-(1,6-у)=7 4)-2 1/3+(х-1/6)=-4 5/9

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1) -12.7 + (x - 5.3) = 0.9
-12.7 + x - 5.3 = 0.9
x - 18 = 0.9
x = 18 + 0.9
x = 18.9

2) 0.3 - (7.2 + x) = -1.5
0.3 - 7.2 - x = -1.5
-6.9 - x = -1.5
-x = -1.5 + 6.9
-x = 5.4
x = -5.4

3) 4 1/2 - (1.6 - y) = 7
9/2 - 8/5 + y = 7
18/4 - 8/5 + y = 7
(90 - 32)/20 + y = 7
58/20 + y = 7
2.9 + y = 7
y = 7 - 2.9
y = 4.1

4) -2 1/3 + (x - 1/6) = -4
-7/3 + x - 1/6 = -4
-21/6 + 6x/6 - 1/6 = -4
-22/6 + 6x/6 = -4
6x/6 = -4 + 22/6
x = -2 + 22/6
x = -2 + 3 2/3
x = 1 2/3
x = 5/3

5) -2 1/3 + (х - 1/6) = -4 5/9
-7/3 + x - 1/6 = -44/9
-7/3 + x - 1/6 = -44/9
-22/6 + 6x/6 = -44/9
6x/6 = -44/9 + 22/6
x = -44/9 + 22/6
x = -44/9 + 44/9
x = 0