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.x + 3 = 7 ()
x +3=7 ()
x = 7−3
.x =4
. 2z + 4 = −7
2z + 4 = −7
2z = −7 − 4
2z = −11
. z = −11
2
. 3 4 − 6x = 9
2 3 4
3 4 − 6x = 9
2 3 4
2 × 3 4 − 6x = 2 × 9
3 2 3 3 4
4 − 6x = 3
32
−6x = 3 − 4
23
−6x = 1
6
x = 1 ÷ (−6)
6