-10x + 1 + 7x = 37
-10x+7x+1= 37
-3x+1= 37
Move +1 to the other side. Sign changes from +1 to -1.
-3x+1-1= 37-1
-3x= 36
divide by -3
-3x/-3= 36/-3
x= -12
Answer : x= -12
