486÷x=18 x=
800-x=123 x=
2x+7x+2.1=12
x=
15.6+2x=23.4
( )
①x÷5.8=3.2
②7×7-3x=40
③5x+6x=99
④40-9x=5
⑤6(x-3)=24
⑥3x-7.68=0.42
①55+x=152
②2.3x+0.9x=16
③0.45x-4.5×6=45
④x÷2.4=1.5
⑤X-0.36+1.24=9
⑥2(x-3.6)=8.2