a(x+b)=c by making x the subject of the formula.
ax+ab=c
divide both sides by an
a(x+b)÷ab=c ÷ a+b
ax=c/a+b
ax + ab = c agree so far but
ax = c-ab
x = (c-ab)/a
or
x = c/a - b
ax+ab=c
divide both sides by an
a(x+b)÷ab=c ÷ a+b
ax=c/a+b
ax = c-ab
x = (c-ab)/a
or
x = c/a - b