Question

7³+8-9(-12)=


2x-1=3x-4

-15-63+7(-8-9)=

+12-(-7)(-8)=​

Answer 1

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7³+8-9(-12)=

=343+8−(9)(−12)

=351−(9)(−12)

=351−(−108)

=459

2x-1=3x-4

2x−1−3x=3x−4−3x

−x−1=−4

−x−1+1=−4+1

−x=−3

−x/−1=−3/−1

x=3

-15-63+7(-8-9)=

=−78+7(−8−9)

=−78+(7)(−17)

=−78+−119

=−197

+12-(-7)(-8)=

=12−56

=−44