(X+30)÷3.5=X÷2-30怎么算?

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(X+30)÷3.5=X÷2-30怎么算?
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(X+30)÷3.5=X÷2-30怎么算?
(X+30)÷3.5=X÷2-30怎么算?

(X+30)÷3.5=X÷2-30怎么算?
x+30 x
——— = — - 30
3.5 2
两边同时乘以14得
4(x+30) = 7x - 420
4x + 120 = 7x - 420
3x = 540
x = 180

(X+30)÷3.5=X÷2-30
7×〔(X+30)÷3.5〕=7×(X÷2-30)
2×(X+30)=3.5x-210
2x+60=3.5x-210
60+210=3.5x-2x
1.5x=270
x=180