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360 = x + 3x + 9x
360 = 13x // ÷ 13
360 ÷ 13 = x
27 × 9 ÷ 13 = x
x = 27,7
360 = 27,7 + 3 × 27,7 + 9 × 27,7
360 = 27,7 + 83 + 249,3
360 = 360
zad.2
180 = x + (x - 20) + (x - 40) + (x - 60)
180 = 4x - 120 // + 120
4x = 300 // ÷ 4
x = 300 ÷ 4
x = 3 ÷ 4 × 100
x = 0,75 × 100
x = 75
180 = 75 + (75 - 20) + (75 - 40) + (75 - 60)
180 = 75 + 55 + 35 + 15
180 = 180