Multiply the bracket(s) to get rid of the brackets as this in the first step in BIDMAS/BODMAS.
color(orange)(-7.3 xx x=-7.3x
color(blue)(-7.3 xx 7.1=-51.83
This gives us color(blue)(-100.47)=color(orange)(-7.3x)color(blue)(-51.83)color(orange)(-7.9x)
Collect like terms on each side if possible, in this instance only the right...
color(orange)(-7.3x + -7.9x=-15.2x
This therefore leaves us with:
=> color(blue)(-100.47)=color(orange)(-15.2x)color(blue)(-51.83)
We want x on its own so therefore we do the opposite of color(blue)(-51.83 which is adding color(blue)(51.83 to both sides, as you have to add to both sides of the equation...
color(blue)(-100.47)=color(orange)(-15.2x)color(blue)(-51.83)
=> color(blue)(-48.64)=color(orange)(-15.2x) color(Blue)((+51.83)
Therefore to solve for x, we divide the total over how many x's we have which goes to...
color(red)(x=-48.64/15.2
As -1 xx -1=1
color(red)(x=48.64/15.2=3.2
Round if necessary, But in this case it's not, so leave it as:
=> color(red)(x=3.2)