10(9-x) + x=4/7[10x+(9 - x)]=
90-10x+x=4/7[10x+9-x]=
90-10x+x=5⁵/₇x+5¹/₇-⁴/₇x=
-10x+x-5⁵/₇x+⁴/₇x=5¹/₇-90=
-14¹/₇x=-84⁶/₇
x=6
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10(9-x) + x=4/7[10x+(9 - x)]=
90-10x+x=4/7[10x+9-x]=
90-10x+x=5⁵/₇x+5¹/₇-⁴/₇x=
-10x+x-5⁵/₇x+⁴/₇x=5¹/₇-90=
-14¹/₇x=-84⁶/₇
x=6