Answer:
x = -1
Step-by-step explanation:
3(2x + 7) = 6x + 21 (multiply all numbers in the bracket to the 3 outside the bracket.
6x + 21 = -31 + 46
+31 +31
6x + 52 = 46
-52 -52
6x = -6
÷6 ÷6
