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x in (-oo:+oo)
x+(3/4)*x+3 = 213 // - 213
x+(3/4)*x-213+3 = 0
7/4*x-210 = 0 // + 210
7/4*x = 210 // : 7/4
x = 210/7/4
x = 120
x = 120
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