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(3/4)*(x-16) = 21/4 // - 21/4
(3/4)*(x-16)-(21/4) = 0
(3/4)*(x-16)-21/4 = 0
3/4*(x-16)-21/4 = 0
(3/4*4*(x-16))/4-21/4 = 0
3/4*4*(x-16)-21 = 0
3*x-69 = 0
(3*x-69)/4 = 0
(3*x-69)/4 = 0 // * 4
3*x-69 = 0
3*x-69 = 0 // + 69
3*x = 69 // : 3
x = 69/3
x = 23
x = 23
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