Answer:
9x+3x=12x
180/12=15
9 x 15= 135
3 x 15= 45
135+45=180
x=15
Step-by-step explanation:
302yrs old.... DAM
2x-400=204
+400 +400
2x=604
/2 /2
x=302
6
200-44=156
156/2=6.5
Round 6.5 to 6.
Expression:-
10x + 3y. add like terms