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X in (-oo:+oo)
0.2*(X-12) = (1/4)*(X-15) // - (1/4)*(X-15)
0.2*(X-12)-((1/4)*(X-15)) = 0
0.2*(X-12)+(-1/4)*(X-15) = 0
0.2*(X-12)-1/4*(X-15) = 0
0.2*(X-12)-1/4*(X-15) = 0
1.35-0.05*X = 0
1.35-0.05*X = 0
1.35-0.05*X = 0 // - 1.35
-0.05*X = -1.35 // : -0.05
X = -1.35/(-0.05)
X = 27
X = 27
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