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x+3*x+4*x+(3*x)/2-2 = 169 // - 169
x+3*x+4*x+(3*x)/2-169-2 = 0
19/2*x-171 = 0 // + 171
19/2*x = 171 // : 19/2
x = 171/19/2
x = 18
x = 18
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