Tentukan nilai x, jika (2x + 1) + (2x + 2) + (2x + 3) + … + (2x + 50)

(2x+1) + (2x+2) + (2x+3) + … + (2x+50) = 4275
= 2x(50) + (1+2+3+…+50) = 4275
= 100x + 1275 = 4275
= 100x = 4275 – 1275
100x = 3000
x       = 30