Let's solve your equation step-by-step.
x+78=90
Step 1: Subtract 78 from both sides.
x+78−78=90−78
x=12
Please put brainliest!
Answer:-5
Step-by-step explanation:
70 ( and i have to type enough characters to submit )
4x + 8 +3x +12 +6x = perimeter
13x + 20 = perimeter