21(2-x)+12=44 multiply 21 by everything inside parentheses first
(21*2)+(21*-x)+12=44 42-21x+12=44 combine like terms (42+12)-21x=44 54-21x=44 subtract 54 from both sides -21x= -10 divide both sides by -21 negative divided by negative becomes positive x= 0.476
