x÷3+x＝18

x÷3+x＝18 先化简,再计算2x^-18/4-4x+x^ ÷ 3-x/x^+x-6,其中x=4 化简：〔（x^2+18x+72)÷（x+12)-(x^2+5x-6)÷(x-1)〕·(x^3-2x^2-x+1) （x²-6x+9）÷x+3分之x²-9x+18,计算 (x平方-6x+9)÷(x+3)分之(x的平方-9x+18) (x^2-6x+9)÷x^2-9x+18/x+3 x-5/9x＝1/3x+18 18+x÷60+x＝40% x的平方+6x分之x的平方+3x-18÷（x的平方+9-6x） [x^2+2x-8/x^3+2x^2+x]÷[(x-2/x)×(x+4/x+1)]化简[x^2+2x-8/x^3+2x^2+x]÷[(x-2/x)×(x+4/x+1)]化简 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x 12x+3x＝18+27 11x+40＝100-9 9x+30＝90+6x 2.5x-x＝6+1.5 2x+18＝7x+3 36+2x＝7x-14 (x^2-x-6)÷(x-3) x^3-18x^2+81x 化简 [3x/(x+2)-x/(x=2)]÷x/(x^2-4)化简 [3x/(x+2)-x/(x-2)]÷x/(x^2-4 3x/(x-2)-x/(x+2)÷2x/(x-4)化简3x/（x-2）-x/(x+2)÷2x/(x²-4)化简 (x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3 x-x÷5＝244 x-13＝96-x+13 12x＝10(x+20) 3.6x÷2=7.2×2x-x÷5＝244x-13＝96-x+1312x＝10(x+20)3.6x÷2=7.2×2x÷3-x÷4＝5这些题方程怎么解,