2.Rozwiąż równanie:
. - znak mnożenia [
(3 . x - 54) . 8 - 159] : 21 = 21
[(3 . x - 54) . 8 - 159] : 21 = 21
[(3 . x - 54) . 8 - 159] = 21*21
(3 . x - 54) . 8 - 159 = 441
(3 . x - 54) . 8 = 441 + 159
(3 . x - 54) . 8 = 600
(3 . x - 54) = 600 : 8
3 . x - 54 = 75
3 . x = 75 + 54
3 . x = 129
x = 129 : 3
x = 43
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[(3 . x - 54) . 8 - 159] : 21 = 21
[(3 . x - 54) . 8 - 159] = 21*21
(3 . x - 54) . 8 - 159 = 441
(3 . x - 54) . 8 = 441 + 159
(3 . x - 54) . 8 = 600
(3 . x - 54) = 600 : 8
3 . x - 54 = 75
3 . x = 75 + 54
3 . x = 129
x = 129 : 3
x = 43