Question

(45+30)-x=12 y-9×5=35 (90+x)-4×10=60

Answer 1

(45+30)-x=12 

75 - x = 12

x = 75 - 12

x = 63




y-9×5=35 

y - 45 = 35

y = 35 + 45

y = 80




(90+x)-4×10=60

90 + x - 40 = 60

50 + x = 60

x = 60 - 50

x = 10

Answer 2

Let's solve each equation one by one:

(45+30)-x=12

First, we simplify the left-hand side by adding 45 and 30 together:

75 - x = 12

Next, we isolate x by subtracting 75 from both sides:

-x = -63

Finally, we solve for x by dividing both sides by -1:

x = 63

y-9×5=35

We simplify the left-hand side by multiplying 9 and 5 together:

y - 45 = 35

Next, we isolate y by adding 45 to both sides:

y = 80

(90+x)-4×10=60

We simplify the left-hand side by multiplying 4 and 10 together:

90 + x - 40 = 60

Next, we simplify further by combining like terms on the left-hand side:

50 + x = 60

Finally, we isolate x by subtracting 50 from both sides:

x = 10

Therefore, the solutions to the three equations are:

x = 63 y = 80 x = 10