Answer: x = 2
Step-by-step explanation: Isolate the variable by dividing each side by factors that don't contain the variable.
x + 3(x + 4) = 20
Multiply the bracket by 3
(3)(x)(3)(4)=3x+12
x+3x+12=20
4x+12=20
Move +12 to the other side. Sign changes from +12 to -12.
4x+12-12=20-12
4x=8
Divide by 4 for both sides.
4x/4=8/4
Cross out 4 and 4 ,divide by 4 and then becomes x
x=2
Answer: x=2
