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(2/5)*(20*x+30)+3*x = 100 // - 100
(2/5)*(20*x+30)+3*x-100 = 0
2/5*(20*x+30)+3*x-100 = 0
2/5*(20*x+30)+3*x-100 = 0
11*x-100+12 = 0
11*x-88 = 0
11*x-88 = 0
11*x-88 = 0 // + 88
11*x = 88 // : 11
x = 88/11
x = 8
x = 8
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