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x in (-oo:+oo)
(-2/7)*(3-(4*x))+8 = 18 // - 18
(-2/7)*(3-(4*x))-18+8 = 0
(-2/7)*(3-4*x)-18+8 = 0
8-2/7*(3-4*x)-18 = 0
8-2/7*(3-4*x)-18 = 0
8/7*x-132/7+8 = 0
8/7*x-76/7 = 0
8/7*x-76/7 = 0
8/7*x-76/7 = 0 // + 76/7
8/7*x = 76/7 // : 8/7
x = 76/7/8/7
x = 19/2
x = 19/2
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