Tìm x biết rằng: (x + 73) : 5 = 20 + 7,5 × 4

Ta có:

(begin{array}{l}left( {x + 73} right):5 = 20 + 7,5 times 4\left( {x + 73} right):5 = 20 + 30\left( {x + 73} right):5 = 50\x + 73 = 50 times 5\x + 73 = 250\x = 250 – 73\x = 177end{array})

Vậy x = 177