Tìm x biết: -2750 - x = 1213 - (-315)
Tìm x biết: –2750 – x = 1213 – (–315).
–2750 – x = 1213 – (–315)
–2750 – x = 1528
–x = – 2750 – 1528
–x = – 4278
x = 4278.