priority of solving math operation
since 7×7=49 , √ 49 is 7
expand 7+10x _6=4x_1
simplify 7+10x_6 to 10x+1
subtract 4x from both sides
simplify 10x+1-4x to 6x+ 1
subtract 1 from both sides
simplify -1-1 to -2
divide both sides by 6
simplify _2÷6 to _1/3
x= _1/3