The first car was loaded with 3 times less coal than the second. How many tons of cargo were loaded into each

The first car was loaded with 3 times less coal than the second. How many tons of cargo were loaded into each of these wagons if 52 tons less were loaded into the first wagon than into the second?

let in the first car there are x tons, then in the second one there are 3x tons or x + 52. we make the equation:
x + 3x = x + x + 52
we transfer all the xes to the right side, while changing the sign:
x + 3x-x-x = 52
consider
2x = 52
x = 26 (tons) coal in the first car
26 + 52 = 78 (tons) of coal in the second car.
answer: 26 and 52