Answer:
X=12
Step-by-step explanation:
First, take the term out parenthesis being careful to manage the sign of individual term carefully :
x+42+3x=90
Next , subtract 42 from each side of the equation to isolate the x term while keeping equation balance :
x+42-42+3x=90-42
x+0+3x=48
x+3x=48
(1+3)x=48
4x=48
Now, Divide both side of equations by 4 to slove of x while keeping equation balance :
4x/4=48/4
x=12
Here,
(12+42)+3*12=90
54+36
90
