Question

nao sei como forma esar contar

Answer 1

x^3+4t+7r+1000= 3r+x^3+1400+4r
x^3-x^3+4t+7r-3r-4r= 1400-1000
0+4t+7r-7r= 400
0+4t+0= 400
4t=400
t= 400/4
t= 100