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X in (-oo:+oo)
(3/10)*(X-30) = 150 // - 150
(3/10)*(X-30)-150 = 0
3/10*(X-30)-150 = 0
3/10*(X-30)-150 = 0
3/10*X-159 = 0
3/10*X-159 = 0
3/10*X-159 = 0 // + 159
3/10*X = 159 // : 3/10
X = 159/3/10
X = 530
X = 530
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