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(1/4)*(x+20) = 30 // - 30
(1/4)*(x+20)-30 = 0
1/4*(x+20)-30 = 0
1/4*(x+20)-30 = 0
1/4*x-25 = 0
1/4*x-25 = 0
1/4*x-25 = 0 // + 25
1/4*x = 25 // : 1/4
x = 25/1/4
x = 100
x = 100
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