Why were standardized math symbols important to the field of mathematics? O They allowed bankers to keep track of money.
O They made it easier to use the scientific method.
O They made it easier for people to understand calculations.
O They led to the creation of schools to teach mathematics.

the correct answer is =   british soldiers attacked and killed five boston townspeople.

what is this news

explanation:

b: to eliminate competition from other farmers

simplify brackets

8 - 2a - 7 = a + 40

simplify 8 - 2a - 7 to -2a + 1

-2a + 1 = a + 40

add 2a to both sides

1 = a + 40 + 2a

simplify a + 40 + 2a to 3a + 40

1 = 3a + 40

subtract 40 from both sides

1 - 40 = 3a

simplify 1 - 40 o -39

-39 = 3a

divide both sides by 3

-39/3 = a

simplify 39/3 to 13

-13 = a

switch sides

a = -13