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(1/5)*(x+5) = 7 // - 7
(1/5)*(x+5)-7 = 0
1/5*(x+5)-7 = 0
1/5*(x+5)-7 = 0
1/5*x-6 = 0
1/5*x-6 = 0
1/5*x-6 = 0 // + 6
1/5*x = 6 // : 1/5
x = 6/1/5
x = 30
x = 30
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