\(x+x+x+x-x=540\)
\(x+x+x+0=540\)
\(x\cdot3=540\)
\(x=540:3\)
\(x=180\)
X+X+X=540
Xx4 =540
X = 540:4
X =135
x + x + x + x - x=540
x + x + x + 0 = 540
x x 3 = 540
x = 540 : 3
x = 180
x + x + x + x - x = 540
x + x + x + 0 = 540
x x 3 = 540
x = 540 : 3
x = 180