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x in (-oo:+oo)
(3/4)*(x-2) = 21 // - 21
(3/4)*(x-2)-21 = 0
3/4*(x-2)-21 = 0
3/4*(x-2)-21 = 0
3/4*x-45/2 = 0
3/4*x-45/2 = 0
3/4*x-45/2 = 0 // + 45/2
3/4*x = 45/2 // : 3/4
x = 45/2/3/4
x = 30
x = 30
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