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x in (-oo:+oo)
(7/4)*(x-4) = 42 // - 42
(7/4)*(x-4)-42 = 0
7/4*(x-4)-42 = 0
7/4*(x-4)-42 = 0
7/4*x-49 = 0
7/4*x-49 = 0
7/4*x-49 = 0 // + 49
7/4*x = 49 // : 7/4
x = 49/7/4
x = 28
x = 28
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