7.2x-3.2x-7.8=12.
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7.2x-3.2x-7.8=12.7.2x-3.2x-7.8=12.7.2x-3.2x-7.8=12.7.2x-3.8x-7.8=12.6（7.2-3.8）x=12.67.83.4x=20.4x=20
7.2x-3.2x-7.8=12.
7.2x-3.2x-7.8=12.
7.2x-3.2x-7.8=12.
7.2x-3.8x-7.8=12.6 （7.2-3.8）x=12.6 7.8 3.4x=20.4 x=20.4÷3.4 x=6 3.4x=20.4 x=20.4/3.4 x=6 (7.2-3
（7.2 - 3.2）x = 12.6+7.8
4x =20.4
x =5.1
7.2X-3.2X=4X
然后两边同时+7.8
得到方程4X=20.4
解得X=5.1
7.2x-3.2x-7.8=12.
7.8X+7.2X=45
3.2x+1.8x=7.8
（X+X)+(X-X)+(X*X)+(X/X)=100
X-35%X=7.8 X+160%X=39
7x-x=7.2
x-20%x=7.2
7x-x=7.2
1.8x-7.2=x
x-0.48x=7.2
x-0.8x=7.2
8x-5.5x=7.57.2x÷3.6=2 3x＋6x-8x=0.7 12x-2x-5x=4.512x-x=0 5x＋x=1.8 3.2x＋1.8x=64.8x-0.8x=6 6.3-0.3x=9.6 8.6x-8.5x=0.720x-2x=36 9x＋6x=4.5 18x-12x=5.42x-1.6x=3.6 18x＋3x=7×6 1.2x-0.5x=0.71.3x＋2.7x=1 4x-3.2x=6.4 0.8x＋3.2x＋3x=562.8x-2x=7.2
1.5x+x=12.
7.8X-X=14.
x+180%x=3.2
x-0.36x=3.2
x*x*x*x*x=80000?
1.(1/X-1 )-2=X^-3X/X^-12.（X/X+1)^+5(X/X+1)+6=03.（8(X^+2X)/X^-1）+ 3（X^-1)/X^+2x