Question 282243
a) {{{7x - 10 = 12}}}

b) {{{3x = 9x - 15}}}

c) {{{4(x - 9) = (x - 5) + 9}}}


For part a:

a) {{{7x - 10 = 12}}}
{{{7x = 22}}} add 10 on both sides
{{{highlight(x = 22/7)}}} divide 7 on both sides


For part b:
b) {{{3x = 9x - 15}}}
{{{-6x = -15}}} subtract 9x on both sides
{{{highlight(x = 5/2)}}} divide both sides by -6 and simplify

For part c:
c) {{{4(x - 9) = (x - 5) + 9}}}
{{{4x - 36) = x + 4 }}} combine like terms and distribute
{{{3x = 40}}} subtract x on both sides and add 36 on both sides
{{{highlight(x = 40/3)}}} divide 3 on both sides