Algebra: A Combined Approach (4th Edition)

$3x + 6 = 2x + 10 + x - 4$ let $x = 1$ $3(1) + 6 = 2(1) + 10 + (1) -4$ $9 = 9$ let $x = 2$ $3(2) + 6 = 2(2) + 10 + (2) -4$ $12 = 12$ let $x = 3$ $3(3) + 6 = 2(3) + 10 + (3) -4$ $15 = 15$