x+(x+20)+(x-10)+70+x=540 .
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![x+(x+20)+(x-10)+70+x=540 .](/uploads/image/z/1590309-45-9.jpg?t=x%2B%28x%2B20%29%2B%EF%BC%88x-10%EF%BC%89%2B70%2Bx%3D540+.)
x+(x+20)+(x-10)+70+x=540 .
x+(x+20)+(x-10)+70+x=540 .
x+(x+20)+(x-10)+70+x=540 .
70+(x+20)+(x-10)+x+x=540
4x+80=540
4x=540-80
4x=460
4x=460÷4
x=115
答:
x+(x+20)+(x-10)+70+x=540
4x+20-10+70=540
4x+80=540
4x=460
x=115