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2x + 1 + x + x + 5 = 30
4x = 24
x = 6
2x + 1 = 13
x = 6
x + 5 = 11
3(x + 4) = 30
x + 4 = 10
2x + 1 + x + x + 5 = 30
4x = 24
x = 6
boki :
2x + 1 = 13
x = 6
x + 5 = 11
b)
3(x + 4) = 30
x + 4 = 10 <- wszystkie 3 boki