Answer:
Step-by-step explanation:
3(10-x) = 3*10 - 3*x = 30 - 3x
When x = 3, -5x + 2 = -5*3 + 2 = - 15 + 2 = -12
-6x - 7 = 11 { add 7 to both sides}
-6x - 7 + 7 = 11+7
-6x = 18 {divide both sides by -6}
-6x/-6 = 18/-6
x = -3
3x + 10 = -20 {subtract 10 from both sides}
3x +10 - 10 = -20 - 10
3x = - 30 {divide both sides by 3}
3x/3x = -30/3
x = -10
