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(1/7)*(x-42) = 6/7 // - 6/7
(1/7)*(x-42)-(6/7) = 0
(1/7)*(x-42)-6/7 = 0
1/7*(x-42)-6/7 = 0
(1/7*7*(x-42))/7-6/7 = 0
1/7*7*(x-42)-6 = 0
x-48 = 0
(x-48)/7 = 0
(x-48)/7 = 0 // * 7
x-48 = 0
x-48 = 0 // + 48
x = 48
x = 48
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