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3*x-2+5 = 15/5-x+3.14*7 // - 15/5-x+3.14*7
3*x+x-(15/5)-(3.14*7)-2+5 = 0
3*x+x-21.98-3-2+5 = 0
4*x-21.98 = 0 // + 21.98
4*x = 21.98 // : 4
x = 21.98/4
x = 5.495
x = 5.495
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