bjr
3x + 20 = 7
3x = 7 - 20
3x = - 13
x = -13/3
2 (L+5) = 3
L+5 = 3/2
L = 3/2 - 5 = 3/2 - 10/2 = -7/2 = -3,5
2 - 4y = 1
-4y = 1 - 2
y = 1/4
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bjr
3x + 20 = 7
3x = 7 - 20
3x = - 13
x = -13/3
2 (L+5) = 3
L+5 = 3/2
L = 3/2 - 5 = 3/2 - 10/2 = -7/2 = -3,5
2 - 4y = 1
-4y = 1 - 2
y = 1/4